How to reproduce:
1. Create and open a new project
2. Create two UI Documents (“first“ and “second“)
3. Open the “first“ UI Document in UI Builder
4. Add and delete the reference to the “second“ UI Document in the UI Builder
5. Save the changes and then open the “second“ UI Document in UI Builder
6. Try referencing the “first“ UI Document in UI Builder
7. Observe the Editor

Expected result: The reference of the “second“ UI Document is successfully placed into the “first“ UI Document
Actual result: A circular dependency warning dialog box is invoked

Reproducible in: 2021.3.45f1, 2022.3.51f1, 6000.0.24f1

Reproduced on: Windows 11 Pro (23H2)
Not reproduced on: No other environment tested

Notes:
- This persists even if the UI Builder is closed and reopened, only restarting the Editor will stop the circular dependency warnings
- The UI Builder probably does not lose the reference to previous elements or UI Documents