There are potentially two bugs at play here. One with scatter/gather and one for PSR. They both manifest really similarly, so let's try with both disabled.
There is a parameter that is introduced in 6.3 for amdgpu.sg_display. Can you please explicitly set that to "0" along with the PSR disable parameter and see if everything is cleared up?
If it is; please allow PSR again and see if SG disabled alone is enough to fix it.
There are potentially two bugs at play here. One with scatter/gather and one for PSR. They both manifest really similarly, so let's try with both disabled.
There is a parameter that is introduced in 6.3 for amdgpu.sg_display. Can you please explicitly set that to "0" along with the PSR disable parameter and see if everything is cleared up?
If it is; please allow PSR again and see if SG disabled alone is enough to fix it.