Also noticed it on Fedora Silverblue 43 6.18.13-200.fc43.x86_64 on a FW13 AMD7040, I get similar logs:
Feb 23 19:05:31 ... kernel: amdgpu 0000:c1:00.0: [drm] *ERROR* dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic data
Feb 23 19:05:31 ... kernel: amdgpu 0000:c1:00.0: [drm] *ERROR* dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic data
Feb 23 19:05:41 ... kernel: amdgpu 0000:c1:00.0: [drm] *ERROR* [CRTC:80:crtc-0] flip_done timed out
It started happening recently (not having seen this issue before), and even had it happen twice in one evening. There was another thread on the forum with this same error, naming GNOME Night Light feature as known potential cause for the issue. After turning off Night Light, I haven’t seen the crash anymore (anecdotal, but might help others).