Hey! Did you ever find any fix to this?
This appears to be an issue with SteamVR/OpenXR as the latest Beat Saber alpha release is having the same issues. (Switching Unity versions 2019 → 2021 / oVR → oXR)
Same issues happened with OpenVR on current public release (since multiplayer update) where anything above 80hz would cause haptics to cut out entirely, until a trigger press.
Currently with the OpenXR test these issues have gotten significantly worse, and all the mods/fixes that were previously made for oVR are no longer working.
For some insight:
Previously, OpenVR/SteamVR didn’t support fancy haptic effects like amplitude.
BS has a thread that essentially spams haptics events and something, something, overflow bluetooth stack. Fix was to buffer haptic events to 80hz.