Shadows are exetremely rough and aliased if r.shadow.FilterMethod is set to 1.
Working as expected in 4.21 CL# 4753647
Found in 4.22 CL# 5660361 and 4.23 CL# 5810496
The spheres shadow will be heavily aliased
A soft shadow like shown in 4.21
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-72679 in the post.