Hey!
Did you ever find out what was wrong or some kind of workaround? I've had this issue for a long time as well and done multiple updates to both DCS and Oculus / Meta Quest Link and nothing has solved it. For me it works like the first time I press the button inside DCS. Then I momentarily have a lot of screen tearing and lagging inside the VR-headset, like there are some buffering issues or something, and suddenly it goes back to smooth as butter. If I now switch back to DCS the 'Oculus'-button on my right controller does nothing and it will remain unresponsive until I restart the Meta Quest Link software.