Using a generic rig as provided in the SDK and generic avatars now animate locally only.
Anyone else in the world just sees you in whatever your T-pose-equivalent pose would be for the generic and you slide around, unmoving.
This is affecting older avatars as well as freshly uploaded avatars.
If you need a sample, grab any avatar from my duck world: https://vrchat.com/home/launch?worldId=wrld_1a86eb1c-19f4-491d-98d7-2656e92f05a6
Build: 801