Removing Configured variant from “Variant map for app slicing” breaks Project Settings window UI

Steps to reproduce:

1. Open the attached "ODRTest" project from Google Drive link
2. In Build Profiles change Platform to tvOS
3. Go to Edit > Project Settings > Player Settings
4. If not enabled then enable “Use on-demand resources” setting
5. Unfold “Variant map for app slicing”
6. Select requirement "variant1: iPad ; Metal2v3" in the "Configured variant names"
7. Press "-" to Remove selection from the list in "Configured variant names"
8. Observe the Project Settings window

Actual results: removing selection from the list breaks Project Settings window UI and "ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection." are spammed in the Console window

Expected results: no errors, removing selection from the list should no break Project Settings window UI

Reproducible with versions: 6000.1.0b1, 6000.1.1f1, 6000.2.0a10

Not reproducible with versions: 6000.0.48f1, 6000.1.0a9

Tested on (OS): Windows 11

Notes:

• when testing on 6000.1.0a9 active Build Platform should be set to iOS, because "Variant map for slicing" is not available on tvOS for this specific version