Hierarchy V2: unsupported drag and drop is rejected silently with no feedback or reason shown to the user

Steps to reproduce:

1. Create a new Universal 3D project via Unity Hub
2. Create a Prefab that has at least two child GameObjects (empty GameObject with two child empties, dragged into the Project window to make a Prefab)
3. Drag an instance of the Prefab into the Scene/Hierarchy
4. Expand the instance and try to drag one of the original child GameObjects up or down to reorder it among its siblings

Actual results: The drag is rejected silently - no drop/insert indicators appear and nothing happens. The user gets no feedback that the operation is unsupported and no reason (e.g. that reordering a Prefab instance's original children must be done in Prefab Mode).

Expected results: When an unsupported drag and drop is rejected, the Hierarchy communicates it to the user - e.g. a "not allowed" cursor/indicator and/or the "Open in Prefab Mode" prompt - instead of silently doing nothing.

Reproducible with versions: 6000.6.0b1, 6000.6.0b4, 6000.7.0a2

Can't test with versions: 6000.0.79f1, 6000.3.20f1, 6000.5.4f1, 6000.6.0a7 (Old code)

Tested on (OS): Windows 11, macOS