With Forward Shading, MSAA and Accurate Velocities from Vertex Deformation enabled the viewport breaks. If any of these settings are different, the viewport is fine again.
Found in 4.23 CL# 8386587 and 4.24 CL# 8569829
Steps with attached project:
The viewport renders like the attached image
The viewport would be normal
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-80337 in the post.