Critical Shell/Explorer.exe Boot Loop and Flickering on Recent Windows 11 Insider Build

Hello Windows Insider Team,

I am writing to report a critical UI/system stability issue encountered immediately after updating to and restarting the recent Windows 11 Insider build on my machine.

Issue Description: Upon finalizing the update and rebooting, the desktop shell entered an infinite crash loop. The Windows background and active windows were flickering/blinking rapidly, and the Start Menu and Taskbar were completely missing/unresponsive.

Key Diagnostics:

Task Manager Stability: Interestingly, the Task Manager  remained completely stable and unaffected by the flickering, confirming the core OS and graphic drivers were functional.

Attempted Fixes: Restarting explorer.exe via Task Manager did not resolve the issue. Attempting to delete the IrisService registry key HKCU > SOFTWARE > Microsoft > Windows > CurrentVersion > IrisService only stabilized the Start Menu for a brief moment before the flickering loop resumed.

Resolution: The system was only stabilized after bypassing the UI via Task Manager, booting into the Advanced Startup menu, and performing an "Uninstall latest feature update" rollback to the previous working Insider build.

I wanted to bring this to your attention as the crash loop completely breaks usability for users hitting this specific flight. Please let me know if you need any specific diagnostic logs from my previous build state to help isolate the bug.

Best regards,

Suryanarana N