Animating VRC PhyBone.Allow Grabbing no longer works since the Unity 2022 beta.
A physbone was uploaded with allow grabbing off, and animated to enable it under certain conditions. In game it appears to remain non-grabbable regardless of animation.
The physbone in question is using version 1.0 in SDK 3.2.0. I have not tested extensively yet. Tomorrow I will make a clean test project to rule out other variables.
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I can confirm that animating VRCPhyBone.AllowGrabbing no longer works since the Unity 2022 beta.
However this is consistent with in-editor behavior with SDK after they added the "other" option in the physbone grabbable setting.
In play mode the physbone grabbable setting will be stuck at "false" and any attempts to change it will be changed back to "false" by the animation (even though the animation was setting it to true aka 1).
Strangely the Unity 2022 beta has caused this behavior to now also be reflected in-game.
I have worked around this issue by changing all animations that used to animate VRCPhysBone.AllowGrabbing to VRCPhysBone.GrabFilter.allowSelf instead. Though if your goal is to not break legacy content then I think this should be fixed, starting with the bug in the SDK.