When using OVRPlugin with MetaXR (Quest 3), UE5.4.4 does not detect Oculus Touch Button B Press. It will detect button B touch events, but not press events. When I switch the MetaXR plugin to use Epic Native OpenXR with Oculus vendor extensions instead (with Steam VR running), the B button press events are detected in game again. This might be an issue with the OVRPlugin drivers.
I fixed this by downloading the Oculus fork of Unreal Engine 5.4.3 and using that version of UE5 to run VR Preview using Android Vulkan Mobile. https://github.com/Oculus-VR/UnrealEngine