diff --git a/packages/app/src/cli/services/dev.ts b/packages/app/src/cli/services/dev.ts
index ee3c066c6d..5d66190187 100644
--- a/packages/app/src/cli/services/dev.ts
+++ b/packages/app/src/cli/services/dev.ts
@@ -25,6 +25,7 @@ import {getCachedAppInfo, setCachedAppInfo} from './local-storage.js'
 import {canEnablePreviewMode} from './extensions/common.js'
 import {fetchAppRemoteConfiguration} from './app/select-app.js'
 import {patchAppConfigurationFile} from './app/patch-app-configuration-file.js'
+import {DevSessionStatusManager} from './dev/processes/dev-session-status-manager.js'
 import {DeveloperPlatformClient} from '../utilities/developer-platform-client.js'
 import {Web, isCurrentAppSchema, getAppScopesArray, AppLinkedInterface} from '../models/app/app.js'
 import {Organization, OrganizationApp, OrganizationStore} from '../models/organization.js'
@@ -71,9 +72,9 @@ export interface DevOptions {
 export async function dev(commandOptions: DevOptions) {
   const config = await prepareForDev(commandOptions)
   await actionsBeforeSettingUpDevProcesses(config)
-  const {processes, graphiqlUrl, previewUrl} = await setupDevProcesses(config)
+  const {processes, graphiqlUrl, previewUrl, devSessionStatusManager} = await setupDevProcesses(config)
   await actionsBeforeLaunchingDevProcesses(config)
-  await launchDevProcesses({processes, previewUrl, graphiqlUrl, config})
+  await launchDevProcesses({processes, previewUrl, graphiqlUrl, config, devSessionStatusManager})
 }
 
 async function prepareForDev(commandOptions: DevOptions): Promise<DevConfig> {
@@ -117,10 +118,10 @@ async function prepareForDev(commandOptions: DevOptions): Promise<DevConfig> {
     await installAppDependencies(app)
   }
 
-  const graphiqlPort = commandOptions.graphiqlPort || (await getAvailableTCPPort(ports.graphiql))
+  const graphiqlPort = commandOptions.graphiqlPort ?? (await getAvailableTCPPort(ports.graphiql))
   const {graphiqlKey} = commandOptions
 
-  if (graphiqlPort !== (commandOptions.graphiqlPort || ports.graphiql)) {
+  if (graphiqlPort !== (commandOptions.graphiqlPort ?? ports.graphiql)) {
     renderWarning({
       headline: [
         'A random port will be used for GraphiQL because',
@@ -224,7 +225,7 @@ export async function warnIfScopesDifferBeforeDev({
           scopesMessage(getAppScopesArray(localApp.configuration)),
           '\n',
           'Scopes in Partner Dashboard:',
-          scopesMessage(remoteAccess?.scopes?.split(',') || []),
+          scopesMessage(remoteAccess?.scopes?.split(',') ?? []),
         ],
         nextSteps,
       })
@@ -301,7 +302,7 @@ async function setupNetworkingOptions(
       ...frontEndOptions,
       tunnelClient,
     }),
-    getBackendPort() || backendConfig?.configuration.port || getAvailableTCPPort(),
+    getBackendPort() ?? backendConfig?.configuration.port ?? getAvailableTCPPort(),
     getURLs(remoteAppConfig),
   ])
   const proxyUrl = usingLocalhost ? `${frontendUrl}:${proxyPort}` : frontendUrl
@@ -330,11 +331,13 @@ async function launchDevProcesses({
   previewUrl,
   graphiqlUrl,
   config,
+  devSessionStatusManager,
 }: {
   processes: DevProcesses
   previewUrl: string
   graphiqlUrl: string | undefined
   config: DevConfig
+  devSessionStatusManager: DevSessionStatusManager
 }) {
   const abortController = new AbortController()
   const processesForTaskRunner: OutputProcess[] = processes.map((process) => {
@@ -375,6 +378,7 @@ async function launchDevProcesses({
     abortController,
     developerPreview: developerPreviewController(apiKey, developerPlatformClient),
     shopFqdn: config.storeFqdn,
+    devSessionStatusManager,
   })
 }
 
diff --git a/packages/app/src/cli/services/dev/processes/dev-session-status-manager.test.ts b/packages/app/src/cli/services/dev/processes/dev-session-status-manager.test.ts
index b754210a6e..b74d8bc825 100644
--- a/packages/app/src/cli/services/dev/processes/dev-session-status-manager.test.ts
+++ b/packages/app/src/cli/services/dev/processes/dev-session-status-manager.test.ts
@@ -1,7 +1,9 @@
-import {devSessionStatusManager, DevSessionStatus} from './dev-session-status-manager.js'
+import {DevSessionStatus, DevSessionStatusManager} from './dev-session-status-manager.js'
 import {describe, test, expect, beforeEach, vi} from 'vitest'
 
 describe('DevSessionStatusManager', () => {
+  const devSessionStatusManager = new DevSessionStatusManager()
+
   beforeEach(() => {
     devSessionStatusManager.removeAllListeners()
     devSessionStatusManager.reset()
diff --git a/packages/app/src/cli/services/dev/processes/dev-session-status-manager.ts b/packages/app/src/cli/services/dev/processes/dev-session-status-manager.ts
index b4feacb146..42360397f5 100644
--- a/packages/app/src/cli/services/dev/processes/dev-session-status-manager.ts
+++ b/packages/app/src/cli/services/dev/processes/dev-session-status-manager.ts
@@ -14,6 +14,11 @@ export class DevSessionStatusManager extends EventEmitter {
     graphiqlURL: undefined,
   }
 
+  constructor(defaultStatus?: DevSessionStatus) {
+    super()
+    if (defaultStatus) this.currentStatus = defaultStatus
+  }
+
   updateStatus(status: Partial<DevSessionStatus>) {
     const newStatus = {...this.currentStatus, ...status}
     // Only emit if status has changed
@@ -35,5 +40,3 @@ export class DevSessionStatusManager extends EventEmitter {
     }
   }
 }
-
-export const devSessionStatusManager = new DevSessionStatusManager()
diff --git a/packages/app/src/cli/services/dev/processes/dev-session.test.ts b/packages/app/src/cli/services/dev/processes/dev-session.test.ts
index 1eaaa421f2..3a8b534662 100644
--- a/packages/app/src/cli/services/dev/processes/dev-session.test.ts
+++ b/packages/app/src/cli/services/dev/processes/dev-session.test.ts
@@ -1,5 +1,5 @@
 import {setupDevSessionProcess, pushUpdatesForDevSession} from './dev-session.js'
-import {devSessionStatusManager} from './dev-session-status-manager.js'
+import {DevSessionStatusManager} from './dev-session-status-manager.js'
 import {DeveloperPlatformClient} from '../../../utilities/developer-platform-client.js'
 import {AppLinkedInterface} from '../../../models/app/app.js'
 import {AppEventWatcher} from '../app-events/app-event-watcher.js'
@@ -39,6 +39,7 @@ describe('setupDevSessionProcess', () => {
       appWatcher: {} as AppEventWatcher,
       appPreviewURL: 'https://test.preview.url',
       appLocalProxyURL: 'https://test.local.url',
+      devSessionStatusManager: new DevSessionStatusManager(),
     }
 
     // When
@@ -60,6 +61,7 @@ describe('setupDevSessionProcess', () => {
         appWatcher: options.appWatcher,
         appPreviewURL: options.appPreviewURL,
         appLocalProxyURL: options.appLocalProxyURL,
+        devSessionStatusManager: options.devSessionStatusManager,
       },
     })
   })
@@ -73,6 +75,7 @@ describe('pushUpdatesForDevSession', () => {
   let appWatcher: AppEventWatcher
   let app: AppLinkedInterface
   let abortController: AbortController
+  let devSessionStatusManager: DevSessionStatusManager
 
   beforeEach(() => {
     vi.mocked(formData).mockReturnValue({append: vi.fn(), getHeaders: vi.fn()} as any)
@@ -83,7 +86,7 @@ describe('pushUpdatesForDevSession', () => {
     app = testAppLinked()
     appWatcher = new AppEventWatcher(app)
     abortController = new AbortController()
-    devSessionStatusManager.reset()
+    devSessionStatusManager = new DevSessionStatusManager()
     options = {
       developerPlatformClient,
       appWatcher,
@@ -92,6 +95,7 @@ describe('pushUpdatesForDevSession', () => {
       organizationId: 'org123',
       appPreviewURL: 'https://test.preview.url',
       appLocalProxyURL: 'https://test.local.url',
+      devSessionStatusManager,
     }
   })
 
diff --git a/packages/app/src/cli/services/dev/processes/dev-session.ts b/packages/app/src/cli/services/dev/processes/dev-session.ts
index 7230dd482f..6bc6532ebd 100644
--- a/packages/app/src/cli/services/dev/processes/dev-session.ts
+++ b/packages/app/src/cli/services/dev/processes/dev-session.ts
@@ -1,5 +1,5 @@
 import {BaseProcess, DevProcessFunction} from './types.js'
-import {devSessionStatusManager} from './dev-session-status-manager.js'
+import {DevSessionStatusManager} from './dev-session-status-manager.js'
 import {DeveloperPlatformClient} from '../../../utilities/developer-platform-client.js'
 import {AppLinkedInterface} from '../../../models/app/app.js'
 import {getExtensionUploadURL} from '../../deploy/upload.js'
@@ -31,6 +31,7 @@ interface DevSessionOptions {
   appWatcher: AppEventWatcher
   appPreviewURL: string
   appLocalProxyURL: string
+  devSessionStatusManager: DevSessionStatusManager
 }
 
 interface DevSessionProcessOptions extends DevSessionOptions {
@@ -88,7 +89,7 @@ export const pushUpdatesForDevSession: DevProcessFunction<DevSessionOptions> = a
   {stderr, stdout, abortSignal: signal},
   options,
 ) => {
-  const {appWatcher} = options
+  const {appWatcher, devSessionStatusManager} = options
 
   const processOptions = {...options, stderr, stdout, signal, bundlePath: appWatcher.buildOutputPath}
 
@@ -164,7 +165,7 @@ async function handleDevSessionResult(
     await printSuccess(`✅ Updated`, processOptions.stdout)
     await printActionRequiredMessages(processOptions, event)
   } else if (result.status === 'created') {
-    devSessionStatusManager.updateStatus({isReady: true})
+    processOptions.devSessionStatusManager.updateStatus({isReady: true})
     await printSuccess(`✅ Ready, watching for changes in your app `, processOptions.stdout)
   } else if (result.status === 'aborted') {
     outputDebug('❌ Session update aborted (new change detected or error in Session Update)', processOptions.stdout)
@@ -174,7 +175,7 @@ async function handleDevSessionResult(
 
   // If we failed to create a session, exit the process. Don't throw an error in tests as it can't be caught due to the
   // async nature of the process.
-  if (!devSessionStatusManager.status.isReady && !isUnitTest()) {
+  if (!processOptions.devSessionStatusManager.status.isReady && !isUnitTest()) {
     throw new AbortError('Failed to start dev session.')
   }
 }
@@ -253,7 +254,7 @@ async function bundleExtensionsAndUpload(options: DevSessionProcessOptions): Pro
   // Create or update the dev session
   if (currentBundleController.signal.aborted) return {status: 'aborted'}
   try {
-    if (devSessionStatusManager.status.isReady) {
+    if (options.devSessionStatusManager.status.isReady) {
       const result = await devSessionUpdateWithRetry(payload, options.developerPlatformClient)
       const errors = result.devSessionUpdate?.userErrors ?? []
       if (errors.length) return {status: 'remote-error', error: errors}
@@ -363,5 +364,5 @@ async function printLogMessage(message: string, stdout: Writable, prefix?: strin
 async function updatePreviewURL(options: DevSessionProcessOptions, event: AppEvent) {
   const hasPreview = event.app.allExtensions.filter((ext) => ext.isPreviewable).length > 0
   const newPreviewURL = hasPreview ? options.appLocalProxyURL : options.appPreviewURL
-  devSessionStatusManager.updateStatus({previewURL: newPreviewURL})
+  options.devSessionStatusManager.updateStatus({previewURL: newPreviewURL})
 }
diff --git a/packages/app/src/cli/services/dev/processes/setup-dev-processes.ts b/packages/app/src/cli/services/dev/processes/setup-dev-processes.ts
index 75ed92d33f..64e597f2b5 100644
--- a/packages/app/src/cli/services/dev/processes/setup-dev-processes.ts
+++ b/packages/app/src/cli/services/dev/processes/setup-dev-processes.ts
@@ -8,7 +8,7 @@ import {WebProcess, setupWebProcesses} from './web.js'
 import {DevSessionProcess, setupDevSessionProcess} from './dev-session.js'
 import {AppLogsSubscribeProcess, setupAppLogsPollingProcess} from './app-logs-polling.js'
 import {AppWatcherProcess, setupAppWatcherProcess} from './app-watcher-process.js'
-import {devSessionStatusManager} from './dev-session-status-manager.js'
+import {DevSessionStatusManager} from './dev-session-status-manager.js'
 import {environmentVariableNames} from '../../../constants.js'
 import {AppLinkedInterface, getAppScopes, WebType} from '../../../models/app/app.js'
 
@@ -79,6 +79,7 @@ export async function setupDevProcesses({
   processes: DevProcesses
   previewUrl: string
   graphiqlUrl: string | undefined
+  devSessionStatusManager: DevSessionStatusManager
 }> {
   const apiKey = remoteApp.apiKey
   const apiSecret = remoteApp.apiSecretKeys[0]?.secret ?? ''
@@ -100,7 +101,7 @@ export async function setupDevProcesses({
     ? `http://localhost:${graphiqlPort}/graphiql${graphiqlKey ? `?key=${graphiqlKey}` : ''}`
     : undefined
 
-  devSessionStatusManager.updateStatus({isReady: false, previewURL, graphiqlURL})
+  const devSessionStatusManager = new DevSessionStatusManager({isReady: false, previewURL, graphiqlURL})
 
   const processes = [
     ...(await setupWebProcesses({
@@ -150,6 +151,7 @@ export async function setupDevProcesses({
           appWatcher,
           appPreviewURL: appPreviewUrl,
           appLocalProxyURL: devConsoleURL,
+          devSessionStatusManager,
         })
       : await setupDraftableExtensionsProcess({
           localApp: reloadedApp,
@@ -198,6 +200,7 @@ export async function setupDevProcesses({
     processes: processesWithProxy,
     previewUrl: previewURL,
     graphiqlUrl: graphiqlURL,
+    devSessionStatusManager,
   }
 }
 
diff --git a/packages/app/src/cli/services/dev/ui.test.tsx b/packages/app/src/cli/services/dev/ui.test.tsx
index c9576b10f8..b2096ab83b 100644
--- a/packages/app/src/cli/services/dev/ui.test.tsx
+++ b/packages/app/src/cli/services/dev/ui.test.tsx
@@ -1,7 +1,7 @@
 import {renderDev} from './ui.js'
 import {Dev} from './ui/components/Dev.js'
 import {DevSessionUI} from './ui/components/DevSessionUI.js'
-import {devSessionStatusManager} from './processes/dev-session-status-manager.js'
+import {DevSessionStatusManager} from './processes/dev-session-status-manager.js'
 import {testDeveloperPlatformClient} from '../../models/app/app.test-data.js'
 import {afterEach, describe, expect, test, vi} from 'vitest'
 import {mockAndCaptureOutput} from '@shopify/cli-kit/node/testing/output'
@@ -21,6 +21,7 @@ const developerPreview = {
 }
 
 const developerPlatformClient = testDeveloperPlatformClient()
+const devSessionStatusManager = new DevSessionStatusManager()
 
 afterEach(() => {
   mockAndCaptureOutput().clear()
@@ -60,6 +61,7 @@ describe('ui', () => {
         abortController,
         developerPreview,
         shopFqdn,
+        devSessionStatusManager,
       })
 
       expect(vi.mocked(Dev)).not.toHaveBeenCalled()
@@ -103,6 +105,7 @@ describe('ui', () => {
         abortController,
         developerPreview,
         shopFqdn,
+        devSessionStatusManager,
       })
       abortController.abort()
 
@@ -142,6 +145,7 @@ describe('ui', () => {
         abortController,
         developerPreview,
         shopFqdn,
+        devSessionStatusManager,
       })
       abortController.abort()
 
@@ -173,7 +177,17 @@ describe('ui', () => {
       const abortController = new AbortController()
 
       // eslint-disable-next-line @typescript-eslint/no-floating-promises
-      renderDev({processes, previewUrl, graphiqlUrl, graphiqlPort, app, abortController, developerPreview, shopFqdn})
+      renderDev({
+        processes,
+        previewUrl,
+        graphiqlUrl,
+        graphiqlPort,
+        app,
+        abortController,
+        developerPreview,
+        shopFqdn,
+        devSessionStatusManager,
+      })
 
       await new Promise((resolve) => setTimeout(resolve, 100))
 
@@ -209,7 +223,17 @@ describe('ui', () => {
       const abortController = new AbortController()
 
       // eslint-disable-next-line @typescript-eslint/no-floating-promises
-      renderDev({processes, previewUrl, graphiqlUrl, graphiqlPort, app, abortController, developerPreview, shopFqdn})
+      renderDev({
+        processes,
+        previewUrl,
+        graphiqlUrl,
+        graphiqlPort,
+        app,
+        abortController,
+        developerPreview,
+        shopFqdn,
+        devSessionStatusManager,
+      })
 
       await new Promise((resolve) => setTimeout(resolve, 100))
 
@@ -258,6 +282,7 @@ describe('ui', () => {
         abortController,
         developerPreview,
         shopFqdn,
+        devSessionStatusManager,
       })
 
       await new Promise((resolve) => setTimeout(resolve, 100))
diff --git a/packages/app/src/cli/services/dev/ui.tsx b/packages/app/src/cli/services/dev/ui.tsx
index 13a03806e7..6fb6f2fcfc 100644
--- a/packages/app/src/cli/services/dev/ui.tsx
+++ b/packages/app/src/cli/services/dev/ui.tsx
@@ -1,6 +1,6 @@
 import {Dev, DevProps} from './ui/components/Dev.js'
 import {DevSessionUI} from './ui/components/DevSessionUI.js'
-import {devSessionStatusManager} from './processes/dev-session-status-manager.js'
+import {DevSessionStatusManager} from './processes/dev-session-status-manager.js'
 import React from 'react'
 import {render} from '@shopify/cli-kit/node/ui'
 import {terminalSupportsPrompting} from '@shopify/cli-kit/node/system'
@@ -16,7 +16,8 @@ export async function renderDev({
   graphiqlPort,
   developerPreview,
   shopFqdn,
-}: DevProps) {
+  devSessionStatusManager,
+}: DevProps & {devSessionStatusManager: DevSessionStatusManager}) {
   if (!terminalSupportsPrompting()) {
     await renderDevNonInteractive({processes, app, abortController, developerPreview, shopFqdn})
   } else if (app.developerPlatformClient.supportsDevSessions) {