No guards in gesture detection when adding 'Unspecified' to XRFingerShapeType

How to reproduce:
1. Open the attached project “IN-108301”
2. Enter the Play mode with hand tracking
3. Point a finger in front of you
4. Observe the console

Expected result: No exceptions are thrown in the console
Actual result: Exceptions are thrown in the console $"Finger shape type

{target.shapeType}

is invalid for finger shape target condition."

Reproducible with: 1.6.0(6000.1.11f1)

Reproducible on: Windows 11 Enterprise
Not reproducible on: No other environments tested

Reproducible on devices:
Oculus Quest 3 (Quest 3), CPU: Snapdragon XR2 Gen 2 (SM8550), GPU: Adreno (TM) 740

Note: CQA was not able to reproduce this issue

 

Full error:

2025/08/04 09:22:37.968 18453 18472 Error Unity ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
2025/08/04 09:22:37.968 18453 18472 Error Unity Parameter name: Finger shape type Unspecified is invalid for finger shape target condition.
2025/08/04 09:22:37.968 18453 18472 Error Unity   at UnityEngine.XR.Hands.Gestures.XRFingerShapeCondition.CheckCondition (UnityEngine.XR.Hands.XRHandJointsUpdatedEventArgs eventArgs) [0x00000] in <00000000000000000000000000000000>:0 
2025/08/04 09:22:37.968 18453 18472 Error Unity   at UnityEngine.XR.Hands.Gestures.XRHandShape.CheckConditions (UnityEngine.XR.Hands.XRHandJointsUpdatedEventArgs eventArgs) [0x00000] in <00000000000000000000000000000000>:0 
2025/08/04 09:22:37.968 18453 18472 Error Unity   at UnityEngine.XR.Hands.Gestures.XRHandPose.CheckConditions (UnityEngine.XR.Hands.XRHandJointsUpdatedEventArgs eventArgs) [0x00000] in <00000000000000000000000000000000>:0 
2025/08/04 09:22:37.968 18453 18472 Error Unity   at UnityEngine.XR.Hands.Samples.GestureSample.StaticHandGesture.OnJointsUpdated (UnityEngine.XR.Hands.XRHandJointsUpdatedEventArgs eventArgs) [0x00000] in <00000000000000000000000000000000>:0 
2025/08/04 09:22:37.968 18453 18472 Error Unity   at UnityEngine.Events.UnityEvent`1[T0].Invoke (T0 arg0) [0x00000] in <00000000000000000000000000000000>:0 
2025/08/04 09:22:37.968 18453 18472 Error Unity   at