InputActionAsset.FindAction() can't find an action when its name contains a '/' symbol

Reproduction steps:
1. Open the attached “Repro“ project
2. Open “/Assets/Scene.unity“ Scene
3. Enter the Play Mode
4. Observe the Console

Expected result: “Yaw pitch action is null: False“ is printed and then mouse movements are logged in the Console
Actual result: “Yaw pitch action is null: True” is logged

Reproducible with: 1.11.2 (2022.3.55f1, 6000.0.33f1, 6000.1.0a10)

Reproducible on: M1 Max MacOS 15.1.1
Not reproducible on: No other environment tested