As of build 1061 which updated VRChat's version of AVPro, VRC_SyncVideoStream which makes use of it seems to be having issues with a few of its RPCs.
The fast forward and rewind rpcs, as well as the resync and pause rpc, instead of doing what they are supposed to do, causes the video to restart instead.
Reproduction steps:
  1. Go to any world that uses VRC_SyncVideoStream player, such as https://vrchat.com/home/world/wrld_fff5d510-fc53-4e88-9d4e-1e0e45a17aff
  2. Play any video, direct link or youtube etc ( regular videos, not livestreams)
  3. Use fast forward, rewind, resync or pause
  4. Video restarts instead of doing the intended behavior
Updating to the latest version of SDK2 has no effect and the above issues persist. (VRCSDK2-2021.03.09.13.58_Public)