Thank you for the screenshots. A new hotfix has appeared today, it contains some shadow optimization - please try updating the tool and see if this helps. Also, performance in Play In Editor window is always worse, so try to play in Standalone window and see if this helps (you can click the little arrow near the Play button and choose ‘Standalone Game’ - more info here.)
If none of these options will help, I’ll try to brainstorm it further. Maybe it’s something with AMD cards/GPU drivers, but I hope that this is not the case.