Pimax headset cannot resume from standby. Cannot reacquire tracking. SteamVR 1.13.3 beta

[koochy_rat]

This problem recently appeared. Might be 13.3 or 13.2. Basically after leaving the headset idle for a while, SteamVR sorts of gets stuck in a hung state in the last headset orientation. Moving or wearing the headset doesn't help. PiTool shows everything is ok and it indicates the headset is being tracked. Restarting SteamVR fixes this. I never had a problem on earlier betas, and I never updated any Pimax component. PiTool 1.0.1.258, headset 2.1.255.255.

Steps to reproduce:
1) Run SteamVR on Pimax and confirm headset is being tracked
2) Place headset down and leave it until SteamVR says 'Standing by'
3) Wear the headset and notice the screen is stuck at its last orientation and does not track
4) Notice that SteamVR still says 'Standing by'
4) Restart SteamVR
5) Notice everything is now ok

[koochy_rat]

Bug is still present in 1.13.5.

Workaround is to turn off 'Pause VR when headset is idle' in SteamVR settings.