Describe the bug

Completely restarting a scene app works fine.

But calling VR_Shutdown() and then reinitializing OpenVR causes SteamVR to almost freeze, frames are shown once every few seconds.

To Reproduce

Simple modification of hellovr_vulkan to demonstrate the issue: https://github.com/ChristophHaag/openvr/commit/ce4030ab12956e5370ed4c60c0d51e3985981550

System Information (please complete the following information):

• Distribution: Archlinux
• SteamVR version: 1.17.1
• Steam client version:
• Opted into Steam client beta?: Yes
• Graphics driver version: radv mesa git + https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9016
• Gist for SteamVR System Information:
  SteamVR-2021-03-21-PM_11_05_16.txt