How to reproduce:

1. Open the project "IN-97269_FontAssetReassignment"
2. In the Project window, open "buttons.uxml"
3. In the UI Builder window, click on "Button 2"
4. In the Project window delete "SecondAsset.asset"
5. Observe UI Builders Inspector -> Text -> Font Asset

Expected result: Font Asset field is assigned to none
Actual result: Font Asset field is assigned to another Font Asset in the project

Reproducible with: 2022.1.0a1, 2022.3.60f1, 6000.0.42f1, 6000.1.0b10, 6000.2.0a6

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

Notes:

• When the Font Asset is automatically reassigned, it does not work until manually switching it to some other Font Asset (or None) and switching back
• When deleting the last Font Asset in the project, instead of assigning None it assigns Missing
• The Font Asset reassigns to the first buttons Font Asset if it has an Font Asset, if it doesn’t then it goes to the next button until it has a Font Asset
• The button keeps a reference to the original Font Asset, if a new Font Asset is made with the same name as the one that was deleted it automatically assigns it to the Font Asset field