There has been a fix for a similar issue https://gitlab.freedesktop.org/drm/intel/-/issues/203 and the upstream commit f542d671ffcec772a561cd41c7e2394392d9dafb was merged in 5.11. I wonder whether this is the same problem reappearing. Does this happen no matter whether you plug the HDMI monitor (if any) before or after the boot? The bug above mentioned that it happens when the machine was booted without HDMI plugged.