This problem is actually caused by the use of UXF's code in the user project. This is because a method is incorrectly using the EditorApplication.delayCall callback. In recent changes to the Scene view shortcuts, we register a method to that callback to set up the contexts of those shortcuts. Because this called is done incorrectly in the UXF code the shortcuts are not set up properly and that's why the shortcuts don't work in the Scene view.

I contacted directly the code owner of the Unity experimental framework github. However, feel free to report that to them on your side as well.

To fix your problem, just modify the line 65 in the ReorderableArrayInpector.cs to properly use the delayCalls with += instead of = :
EditorApplication.delayCall += () => { EditorApplication.delayCall += () => { FORCE_INIT = false; }; };

Thanks