We are hearing the same from f.lux users on Tahoe 26.5.1 - only M5 Max and M5 Pro seem to be affected. FB23444164

This is still happening in Sonoma 14.5. For me, it was the new Messages + Screen Time integration, so the bug was happening mainly when Messages was open. Our family had hundreds of "approval" plugins (asking for more time) in a Messages thread. Maybe it's only these really big threads, or maybe it's the Screen Time plugin is just buggy. I deleted the affected threads and now don't let them get big like that anymore.