I also ran into the same problem. I only see it in VR though, both in editor standalone and packaged game.
Most curiously though, I have a project which I upgraded from 5.4 to 5.5 and this does note have the issue. I compared DefaultEngine.ini and cannot find any differences between this and other projects.
However, I upgraded this project to UE 5.6 now and the issues are also there.
I disabled most of the TSR features via Cvars or changed their values but none of it had any noticable effect. Using TAA the image is fine (but inferior to what TSR was in 5.4).