Reproduction steps:
1. Create a new project
2. Install Input System, OpenXR Plugin and XR Interaction Toolkit packages
3. Open Input Debug window (Window > Analysis > Input Debugger) and find Dpad Control Layout (Layouts > Controls > Dpad)
4. Enable OpenXR (Edit > Project Settings… > XR Plugin Management)
5. Press “Fix” button for “[OpenXR] [Optional] Switch to use InputSystem.XR.PoseControl instead of OpenXR.Input.PoseControl…” or “[OpenXR] [Optional] Switch to use StickControl thumbsticks instead of Vector2Control…”
6. Open Input Debug window (Window > Analysis > Input Debugger) and observe Control Layouts (Layouts > Controls)

Expected result: Nothing of note happens
Actual result: Dpad disappears from Control Layouts

Reproducible with: 1.7.0 (2021.3.41f1), 1.9.0 (2021.3.41f1, 2022.3.39f1, 6000.0.12f1)

Reproduced on: macOS Sonoma 14.5 (Intel)

Note: Removing “USE_INPUT_SYSTEM_POSE_CONTROL” and “USE_STICK_CONTROL_THUMBSTICKS” Scripting Define Symbols in Player settings makes the Dpad reappear but closing the Editor and reopening it again makes Dpad disappear and removing Scripting Define Symbols again does nothing