The crash has been fixed with https://steamcommunity.com/games/250820/announcements/detail/4441079842361077804 but some applications (hello_xr, openxr-simple-example) that worked on 1.15.19 fail with XR_ERROR_TIME_INVALID e.g. in xrLocateSpace() now. Interestingly xrgears runs.
Nothing extracted yet.
6900 XT, recent radv git build
1.15.19 works fine.
SteamVR-2021-01-18-PM_04_35_46.txt