How to reproduce:
1. Open the attached "GridInvisible" project
2. In the Project window, select the “Triangle.asset” prefab
3. In Scene View, click the "Open Tile Palette" button
4. In the Tile Palette window, observe the TileMap grid

Expected result: TileMap grid is visible
Actual result: TileMap grid is invisible

Reproducible with: 2023.3.0b8, 6000.0.60f1, 6000.2.8f1, 6000.3.0b6, 6000.4.0a2
Not reproducible with: 2023.3.0b7

Reproduced on: macOS 15.7.2 (M1)
Not reproduced on: No other environment tested

Notes:
1. It only reproduces it if the Screen Space Ambient Occlusion render feature is enabled in the PC_Renderer asset.
2. When testing on FAV, remove the AI Navigation package to resolve the errors preventing repro