Meta Avatar hand diverges from SyntheticHand only while grabbing (controller mode, OVR Plugin path)

I’m seeing a consistent mismatch between the Meta Avatar hand and the SyntheticHand only during grabs. In normal/idle updates they stay perfectly aligned; as soon as I grab a HandGrabInteractable the Avatar hand no longer matches the SyntheticHand pose (fingers/ curl differ and there’s a small offset), as shown in the attached screenshot.

# Environment

• Unity 6.2 (URP)
• Meta XR SDK v78 (rolled back to OVR Plugin path; OpenXR package removed)
• Meta Avatar SDK 40.0.1
• Using the Sample Input Manager
• ControllerDrivenHand model (controller mode)
• Tested on Quest 2/3

# Repro steps

1. Use controller mode with ControllerDrivenHand.
2. Add a HandGrabInteractable that has a valid HandGrabPose.
3. Press to grab.
4. Result: the SyntheticHand snaps to the correct grab pose (position + joint curls), but the Meta Avatar hand shows different finger bends and a slight transform offset.

# Expected

• During a grab, the Meta Avatar hand should follow the SyntheticHand joint overrides exactly.
• I’m not developing a hand-tracking-only game, but rather a controller-based game that uses a Hand Model.
  Therefore, it’s important that the system supports ControllerAndHand type input as well, not just hand-tracking.

# What I’ve tried

• Referred to this repo: sigmondkukla/interaction-sdk-avatars2-integration
  → It uses Meta Avatar SDK v35, and hand-tracking mode works perfectly with correct hand poses.
  → However, controller mode is not supported in that sample, so I couldn’t verify the same issue there.
• Switched from OpenXR Plugin to OVR Plugin due to repeated compatibility and pose desync issues.

I’d really appreciate guidance or a minimal sample that demonstrates correct synchronization in this setup. I can share logs or a small repro project if helpful. Thank you!