Sample Scene Thumbnails Corrupted in Unity 6000.0.68f1+ — A change in Unity 6000.0.68f1+ affecting image extensions causes sample scene thumbnail images to become corrupted. This affects both new projects created in 6000.0.68f1+ and existing projects upgraded to this version. Impact: Corrupted thumbnails will cause sample scenes to no longer appear in the ISDK sample menu on-device builds, preventing switching between scenes.
Workaround: Scenes can still be played and cycled through in the Unity Editor via Meta Horizon Link.
If upgrading an existing project: Do not reimport the sample scene thumbnails, as this will trigger the corruption.