diff --git a/test/project/Extensions/BugDepLookup/Manifest.toml b/test/project/Extensions/BugDepLookup/Manifest.toml
new file mode 100644
index 0000000000000..c2531cc5dbacc
--- /dev/null
+++ b/test/project/Extensions/BugDepLookup/Manifest.toml
@@ -0,0 +1,22 @@
+# This file is machine-generated - editing it directly is not advised
+
+julia_version = "1.12.0-DEV"
+manifest_format = "2.0"
+project_hash = "cebcff3d0ef322620470318a4693cc25dfa56077"
+
+[[deps.BugDepLookup]]
+deps = ["SomePackage"]
+path = "."
+uuid = "9b094d01-e697-4a76-8fe8-871656a862e0"
+version = "0.1.0"
+
+    [deps.BugDepLookup.extensions]
+    SomePackageExt = "SomePackage"
+
+    [deps.BugDepLookup.weakdeps]
+    Baz = "5796e38b-8bd2-4f06-8c98-e0a8826bb787"
+
+[[deps.SomePackage]]
+path = "../SomePackage"
+uuid = "678608ae-7bb3-42c7-98b1-82102067a3d8"
+version = "0.1.0"
diff --git a/test/project/Extensions/BugDepLookup/Project.toml b/test/project/Extensions/BugDepLookup/Project.toml
new file mode 100644
index 0000000000000..b1745ae978871
--- /dev/null
+++ b/test/project/Extensions/BugDepLookup/Project.toml
@@ -0,0 +1,13 @@
+name = "BugDepLookup"
+uuid = "9b094d01-e697-4a76-8fe8-871656a862e0"
+authors = ["Cody Tapscott <topolarity@tapscott.me>"]
+version = "0.1.0"
+
+[deps]
+SomePackage = "678608ae-7bb3-42c7-98b1-82102067a3d8"
+
+[weakdeps]
+Baz = "5796e38b-8bd2-4f06-8c98-e0a8826bb787"
+
+[extensions]
+SomePackageExt = "SomePackage"
diff --git a/test/project/Extensions/BugDepLookup/ext/SomePackageExt.jl b/test/project/Extensions/BugDepLookup/ext/SomePackageExt.jl
new file mode 100644
index 0000000000000..d95171c0bbaa1
--- /dev/null
+++ b/test/project/Extensions/BugDepLookup/ext/SomePackageExt.jl
@@ -0,0 +1,5 @@
+module SomePackageExt
+
+using BugDepLookup, SomePackage
+
+end
diff --git a/test/project/Extensions/BugDepLookup/src/BugDepLookup.jl b/test/project/Extensions/BugDepLookup/src/BugDepLookup.jl
new file mode 100644
index 0000000000000..68abc0ddbbe12
--- /dev/null
+++ b/test/project/Extensions/BugDepLookup/src/BugDepLookup.jl
@@ -0,0 +1,4 @@
+module BugDepLookup
+
+
+end