Tilemap does not update when the Sprite property of an assigned Tile asset is changed

Steps to reproduce:

1. Create a new 2D URP project
2. Import the attached "TestTile" folder into the Assets 
3. In the Hierarchy, right-click > 2D Object > Tilemap > Rectangular
4. Select the imported "TestTile.asset" from the Project window
5. In the Inspector, assign the "TestSprite" into the Sprite property
6. Select the "Tilemap" from the Hierarchy
7. Drag the "TestTile" onto the Scene view
8. Observe the Scene view
9. Enter Play mode and exit Play mode (observe the tile appears)
10. Select the "TestTile.asset again and change its Sprite property to any other Sprite
11. Observe the Scene view

Actual results:  The Tilemap continues to render the previously assigned Sprite in the Scene view. The visual update only occurs after entering Play Mode

Expected results: The Tilemap should immediately render the newly assigned Sprite in the Scene view without requiring Play Mode entry or any manual refresh

Reproducible with versions: 6000.4.0a2, 6000.4.10f1, 6000.5.0b11, 6000.6.0a6

Not reproducible with versions: 6000.3.17f1, 6000.4.0a1

Tested on (OS): Windows 11, macOS 26.4

Notes:

• Entering Play mode refreshes the tile and correctly updates it
•  The Play Mode toggle in step 9 is the same bug manifesting earlier. The Tile asset imported in step 2 loses its Sprite reference during import. When the Sprite is assigned in step 5, that first assignment is itself a Tile.sprite property change and fails to refresh the Tilemap visually