It would appear that the 9.1.0 update partially breaks the Black theme (assuming it’s the Compose material3 update based on the changelog), and makes most of the app pages a gray instead of pure black.
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So despite all the messages no logs, no screenshot, I suppose you know that it touches everyone and not just you then ? 
Anyway the theming system is completely rewritten for next release.
Sorry I forgot there was a built in log reporter. I was just looking at logcat manually and didn’t see anything related but logcat probably isn’t as verbose as the built in log reported. And the issue does appear on multiple devices.
If you need I can try to provide logs from the app but if theme system is rewritten I’ll try wait and try next version