Hello
Following problem
Since ver 8.4.0 the XR controller rays are not switching from one controller to the other,
mainly stays on the left controller.
So no picking,..
teleport works
Since this is a clear regression affecting core XR functionality, downgrading to 8.3.1 is your best immediate solution until the bug is patched in the next release.
The issue seems to be related to how the ray switching logic was changed between versions, causing the left controller to dominate the ray casting system.