Local-Only Breakdown of VRCConstraint and PhysBones
available in future release
ジョン骨宮
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.
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WubTheCaptain
჻ ʀᴀɪɴʏ
On my normal custom avatars, I can trigger this almost 100% of the time immediately by just joining a busy instance. It still occurs in private instances by myself, but it takes much longer to trigger.
Anecdotally, I swapped to the beta and I do not have this bug trigger at all in any instances.
n a k u
This happened to me last night!
Tupper - VRChat Head of Community
tracked
TheHappyHopper
I noticed this started happening yesterday when i updated vrchat, oddly enough though the game will lag hard for a solid minute before it does this, like it will hitch every 3 seconds then after a while the hitching stops and physbones no longer work
Merry-san
I am also experiencing the same issue. From what I've found, it seems to occur when an object with a PhysBone component is enabled or disabled through an animation, or when the PhysBone component itself is toggled on and off.
Dextrօ
This appears to affect Contacts as well, when it happens pretty much all VRChat scripts on avatars (PhysBones, VRC Constraints, Contacts, etc) break and the log gets spammed with null reference exceptions