There is an issue where both VRCConstraint and VRCPhysBone unexpectedly stop functioning locally at an unknown timing.
While the exact reproduction steps are still unclear, this bug occurs under certain conditions and has the following characteristics:
・The bug only occurs locally — meaning that even if one user observes the issue, other users often still see everything working normally.
(In some cases, the opposite occurs: everything appears normal to the affected user, but others observe the bug.)
・Once the bug occurs, all avatars (including other users’ avatars) will appear to lose all VRCConstraint and VRCPhysBone functionality from the affected user's perspective.
・Changing avatars, switching worlds, or rejoining does not resolve the issue.
Even after switching avatars, the bug persists on the new avatar.
The only reliable workaround is to restart VRChat entirely.
This bug seems to occur most frequently when I wear the avatar I created:
and visit crowded and heavy worlds.
The first and second images show the bug occurring.
The third image is a reference of how the avatar should look when displayed correctly.
Please excuse any mistakes—I used a translation tool since my English is limited.