After joining an active VRDancing instance, I noticed that the custom URL videos would not play because of an "invalid URL" error. The displayed URLs were consistently missing the first three characters, which are "htt". That wasn't a problem for the videos played from the VRD databasem, only "custom URL" ones.

VRCX overlay also showed the URL without "htt" part in the beginning, so it's not a world UI problem. Other players not on persistence beta experienced no such issues. After switching back to the open-beta and joining the same instance, the problem did not appear.

VRDancing world: https://vrchat.com/home/world/wrld_42377cf1-c54f-45ed-8996-5875b0573a83

Attached are the photos of the in-world error message with URL visible.