To reproduce:
1. Create a new project
2. Create a 3D cube in the hierarchy window
3. Make it a prefab
4. Drag the prefab from Project window to Scene window

Expected: the prefab is added to the scene and appears in the hierarchy
Actual: the prefab can be seen in the scene, but can not be selected, and it's not added to the hierarchy window

Reproduced on:
2022.1.0a10

Not reproducible on:
2022.01.0a9

Notes:
- After dragging the prefab to the Scene window, deleting the prefab from the Project window, and making broken prefab from the Hierarchy window back to a Prefab, two prefabs appear in the Scene.
- Tested on Ubuntu 20.04