Steps to reproduce:
1. Create a new Unity project using Universal 2D Template
2. In the Project window create a Rule tile (Create > 2D > Tiles > Rule Tile)
3. Select Rule Tile Asset in Project window
4. In Inspector add a new Tile Sprite (for example Dungeon Rule Tile from Samples)
5. Enable “Extend Neighbor” checkbox
6. Click on the grid to add arrows on the left or right side to extend 3x3 box
7. Observe the Inspector window

Actual results: Adding more arrows and expanding Tiling Rules box breaks Inspector UI

Expected results: Adding more arrows should not break Inspector UI

Reproducible with versions: 6000.0.66f1, 6000.3.5f1, 6000.4.0b5, 6000.5.0a5

Tested on (OS): Windows 11, macOS Silicon Tahoe 26.2 (M1)