How to reproduce:
1. Create a new 2D Unity Project
2. Go to Window -> 2D -> Tile Palette
3. Create New Tilemap -> Any Tilemap
4. In the Hierarchy, delete the "Grid" GameObject
5. Observe the Scene View

Expected results: The default grid is visible in the Scene View
Actual results: No grid is visible in the Scene View

Reproducible with: 2021.3.47f1, 2022.3.55f1, 6000.0.32f1, 6000.1.0a8

Reproducible on: macOS Sequoia 15.1 (M1)
Not reproducible on: No other environment tested

Note: Restarting the project solves the issue