I’m sorry if going out beta Oculus Software or reinstalling or repairing Oculus software didn’t fix the flash. I stopped flying with MSFS 2 days after the last world update and are waiting for the next one. But one thing I’m sure is for the last week I’m playing a lot of VR Sim and Games and I don’t have this problem which only appeared in MSFS from the very begining, at a lower rate.
My guess is MSFS is doing something dirty on the VR side which collude with the Oculus Software and things are getting worse with the last update of MSFS and Oculus Beta v26.x. As all my other VR apps still working fine with beta v26.x and I never experimented such flash (or whatever it is, a new head position during only one frame more probably) the problem seems to come from MSFS program IMHO…
Let’s hope MSFS Devs and Oculus ones work together to fix this quickly.