I've run into this issue on my 2021 16" M1 Max mbp. Additionally, the issue shows up not only in xcode but also in Qt Creator when developing a C++ project. Some additional notes as it pertains to the error output: The spammed error message only appears when the application is in the foreground of the display. If there's another window in front of it, the log spam stops. Per @joster, it seems to be at a the refresh rate of my display. I've tested it with a 27" Dell 2K monitor, an LG monitor, and some dual samsung monitors using a DisplayLink 4K adapter. All report the same error. Would be great to see some movement on this issue as it's currently preventing me from debugging effectively (regex filters clean up the output, but it's not blocking the error from logging so it's slowing debug builds down).

Sorry to not be adding more information - but this is an issue that's been unaddressed for an entire month. It's halting development of Qt, JUCE, and standard apps with xcode. It seems asinine that there hasn't been an official response on any steps Apple is performing to rectify the issue. What's going on?