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On macOS 12.2.1, running LrC 11.2, I sometimes have a yellow (R: 255, G: 255, B: 0) rectangle for a second instead of my picture.
It doesn't happen always, but enough to be noticed.
I am currently working on Z50 RAW files.
The first thing that you should try is to switch off the GPU support from the Lightroom preferences and check if that helps to fix the issue.
Go to Lightroom > Preferences > Performance tab > Uncheck "Use Graphics Processor" > Restart Lightroom.
Another step is to try to reset the Lightroom preferences.