T-Pose (Down) full reset causes arms to be crossed instead of expected T-Pose

[Spazznyan]

Describe the bug

Setting Reset mode to T-pose (down) in SlimeVR server 18.1 while using arm trackers causes the arms to be incorrectly posed (crossed).

To Reproduce

1. Open SlimeVR server v18.1
2. Assign trackers to: Chest, upper arm, lower arm
3. Set reset pose to T-Pose (Down)
4. Press full reset

Expected behavior

Skeletal model should be in T-pose after full reset

Screenshots/Video

Bug footage:
https://github.com/user-attachments/assets/23180b08-b22b-4b28-8980-0ffa77d28791

17.0 vs 18.1 behaviour:
https://github.com/user-attachments/assets/2fe03825-eab1-4aa1-aa81-f052bf8a2ac5

Desktop

• OS: Windows 10
• Server: 18.1
• Protocols in use: VMC
• SteamVR: No
• Headset in use: No

Additional context

This behaviour is not present in 17.0 or earlier versions of the server software.