Avatar root jitter in 3-point tracking
Laser Raptor
After the latest avatar SDK update, the root of the avatar jitters in 3-point tracking. This is affecting all the objects outside the humanoid armature.
The jitter goes away if the avatar goes to the crouch mode, or if "Use Auto-Footsteps for 3 and 4 point tracking" is disabled in the VRC Avatar Descriptor.
I tried to capture the behaviour using a fresh unity project (created with VCC) and the default pilot avatar, with a cube in the root as a place holder.
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Crispyseaweed
I've noticed an issue with Physbones jittering when interacting with colliders, specifically when gravity is used. Not sure if the two issues are related.
Laser Raptor
Just to clarify: it might seem like a meaningless thing, because it's not causing the avatar to jitter, but it becomes a problem when you need to have a PhysBone on an object that is outside the humanoid rig.
The PhysBones that are not part of the humanoid rig jitter with the root, no matter if their parent object is constrained to the humanoid rig, uses a rigid body joint or IK - the root jiter always propagates to them.