I don’t know of any “workaround” for this. If this is motion-to-photon delay playing against us here, it most likely is a problem with the WMR OpenXR driver implementation (I doubt it would be OpenXR API use problem because it is supposed to be simple an API from an app perspective in this regard).
However there is another factor which my explain why this is showing up in FS2020 only and this would have to do to the camera management in VR. You might want to vote for this one:
[BUG/FEATURE] FS2020 is breaking the VR golden rule: don’t move the camera, the user is