Thank you for your detailed response and suggestions. I’ve explored the workaround you proposed and wanted to share an update: I implemented a second mechanism tied to the loginwindow:done event to close the window after authentication completes. Unfortunately, this didn’t fully resolve the issue. While I can hide or dismiss the plugin window from the second mechanism, I still observe the gray screen appearing for about a second before the desktop environment fully loads. Following your recommendation, I’ve filed a bug report via Feedback Assistant. The ticket number is FB16734033.