Missing context object for "addInitListener" when running in preloaded view group with UI5

[felix9607]

Description

We are running a UI5 application with the UI5 Support Library.
For that application we defined a viewgroup setting for this application to be loaded on startup.
However, in that case, when the application is loaded in the background, the context object of the addInitListener callback is an empty object.
If the application is loaded initially in the foreground, it is working as expected.

Here is some simple example code from the component.js file:

      init: function () {
                // call the base component's init function
                UIComponent.prototype.init.apply(this, arguments);
                // enable routing
                this.getRouter().initialize();

                Ui5SupportLib.connectTo(this);
                this.LuigiClient = Ui5SupportLib.LuigiClient;
                this.LuigiClient.addInitListener((oContext) => {
                    console.log("Luigi Context:",oContext); // oContext === {} if loaded in the background
                });
.
.
.

Expected result

The context to be available with the data, when loaded in the background as well as in foreground

Actual result

When the application is loaded in the background using viewgroup settings, the oContext object === {}

Steps to reproduce

component.js

      init: function () {
                // call the base component's init function
                UIComponent.prototype.init.apply(this, arguments);
                // enable routing
                this.getRouter().initialize();

                Ui5SupportLib.connectTo(this);
                this.LuigiClient = Ui5SupportLib.LuigiClient;
                this.LuigiClient.addInitListener((oContext) => {
                    console.log("Luigi Context:",oContext); // oContext === {} if loaded in the background
                });
.
.
.

Luigi Config

  "viewGroupSettings": {
            "appVG": {
                "preloadUrl": "http://localhost:8080/index.html#",
                "loadOnStartup": true
            }
        },

Load up another microfrontend and make sure, the callback of addInitListener is fired.