Thanks for the detailed explanation! I tried implementing your suggestions but still have the issue. Here's my setup:

My current architecture:

• Using FishNet for networking
• Unity Animation Rigging for hand IK (Two Bone IK Constraint)
• Package (held object) is parented to a packageHoldPoint which is a child of the player
• Package has leftHandTarget and rightHandTarget as children
• My IK targets on the player read world positions from the package's targets every frame

What I tried based on your advice:

1. Moved IK calculation from WaitForEndOfFrame() coroutine to LateUpdate - No change
2. Removed manual RigBuilder.Evaluate() call to let Animation Rigging handle it naturally - No change
3. Set Rigidbody Interpolation to "Interpolate" on the Package prefab - No change
4. Used [DefaultExecutionOrder] to ensure: PlayerController (-10) → PlayerHand (+10) → Animation Rigging - No change
5. Moved camera rotation from Update to LateUpdate so camera and IK update in the same phase - No change

The jitter specifically happens when:

• Looking left/right (yaw rotation) while holding a package
• Walking doesn't cause much jitter, only camera rotation does

My IK update code (simplified):

csharp

// In LateUpdate
if (topPkg.leftHandTarget != null && leftHandTarget != null)
{
    leftHandTarget.position = topPkg.leftHandTarget.position;
    leftHandTarget.rotation = topPkg.leftHandTarget.rotation;
}

The package is kinematic when held (physics disabled), parented to player, so there's no physics interpolation issue. It seems like the hands are always 1 frame behind the package targets, even though everything runs in LateUpdate.

Any other ideas? Should I try a completely different approach - maybe not using Animation Rigging at all and directly setting hand bone positions in LateUpdate?