Prefab Particle Systems are selectable as sub-emitters to other Prefab Particle Systems when assigned through the Project Window

How to reproduce:
1. Open the attached "particle_system_issue" Project
2. In the Project Window, select the "particlesys_2" Prefab
3. In the Inspector, drag and drop the "particlesys" Prefab from the Assets folder to the Particle System field of the Sub Emitters node
4. Click "Yes, Reparent" in the dialogue box
5. Observe the result

Expected result: Prefab Particle Systems are not selectable as sub-emitters to other Particle Systems
Actual result: The prefab Particle System is assigned as a sub-emitter. An instance of the selected sub-emitter is instantiated in the active Scene. The sub-emitter is not assigned as a child to “particlesys_2”.

Reproducible in: 2021.3.33f1, 2022.1.0a9
Not reproducible in: 2022.1.0a10, 2022.3.16f1, 2023.2.4f1, 2023.3.0a19
Fixed in: 2022.1.0a10

Reproducible on: Windows 11
Not reproducible on: No other environments tested