Scene system errors occur in projects using MixedRealityFeatureTools.

[HoloMoto]

Describe the bug

When I try to use the scene system in a Unity project with MRTK imported by MixedReality FeatureTools, I get a lot of dialogs saying "It is not allowed to open a scene in a read-only package.

To reproduce

1. Use the MixedRealityFeatureTool to deploy the MRTK Foundation, Tools, Examples, and Extentions packages.
2. Configure MRTK in the scene and enable the scene system in the MixedRealityToolkit configuration.
3. Set the scene system to [MixedRealitySceneSystem].
4. Sets the default MixedRealitySceneSystem.
5. A dialog box will appear.　"It is not allowed to open a scene in a read-only package."

Expected behavior

The dialog is looping, appearing even after at least a thousand of them have been erased.

This may be due to the fact that MRTK is imported into the Package by using MixedRealityFeatureTools instead of directly under Assets.

Screenshots

Your setup (please complete the following information)

・Unity 2021.1.19f1
・MixedRealityFeatureTool-1.0.2104.4-Beta
・MRTK v2.7

Target platform (please complete the following information)

• HoloLens 2

[HoloMoto]

I found an issue with a similar problem. This may be helpful.
However, when I place the DefaultMixedRealitySceneSystemProfile from Colne in Assets, the same dialog occurs whether I close or close it.
microsoft/MixedReality-WebRTC#526

[david-c-kline]

Investigate which default scenes are in the immutable folder and possibly create a migration code path

[stale]

This issue has been marked as stale by an automated process because it has not had any recent activity. It will be automatically closed in 30 days if no further activity occurs. If this is still an issue please add a new comment with more recent details and repro steps.

[RogPodge]

Marking as closed since we're no longer using the scene system.