Confirmed (Index+NVidia). Not just X-Plane though, it appears to be for all native Linux games (noticed it in Groove Gunner myself). Games using proton are unaffected.
Edit: apparently not all native games. Tried Talos Principle VR and it displayed fine. Balloonatics was also fine, which is interesting because it's from the same developer. The most relevant thing seems to be that Groove Gunner runs on a newer Unity 2019 while the others are Unity 2017 (except Talos, which Croteam's own development, but also from around 2017). So it may be specific to newer builds.
Just tested Groove Gunner on SteamVR Beta 1.22.11 and it was indeed fixed as suggested by the 1.22.10 changelog.
Closing per the last comment.
Nothing extracted yet.
Describe the bug
Entering Xplane 11 VR on Beta 1.22.1 the FOV becomes wrong, looking like a "fishbowl", previous none beta does not have this issue.
To Reproduce
Steps to reproduce the behavior:
Expected behavior
normal Field of View
System Information (please complete the following information):
Screenshots
If applicable, add screenshots to help explain your problem.
SteamVR Beta 1.22.1
SteamVR 1.21.12 (expected)
Note: Commenters who are also experiencing this issue are encouraged to include the "System Information" section in their replies.