Missing Tiles are no longer displayed after entering Play mode

Steps to reproduce:

1. Open the attached project
2. Open the SampleScene
3. Observe the Tiles in the Scene
4. Delete the Tile in the Assets folder
5. Observe the Tiles in the Scene turn magenta to indicate a missing tile asset
6. Enter and Exit Play mode
7. Observe the Scene view again

Actual results: Missing tiles are no longer displayed despite remaining in the Scene

Expected results: Tiles that are missing their assets are displayed in Edit and Play modes

Reproducible with versions: 6000.4.0a2, 6000.4.5f1, 6000.5.0b6, 6000.6.0a4

Not reproducible with versions: 6000.0.73f1, 6000.3.14f1, 6000.4.0a1

Tested on (OS): Windows 11, macOS 26.4.1

Notes:

• Tiles with missing assets will be displayed again after restarting the project or reopening the Scene