How to reproduce:
1. Open the attached “tilemap_issue” project
2. Open the “DemoScene” (Assets > BugExample > Scene > DemoScene)
3. Enter Play mode
4. In the console, take note that the StartUp function is called on both tiles (A and B)
5. Clear the console and press the “RefreshAllTiles” button
6. Observe how only tile B will have its StartUp function called

Expected result: Both tiles will have their StartUp function called
Actual result: Only the tile without an Instanced GameObject attached has its Startup function called

Reproducible in: 2022.3.14f1, 2023.2.1f1, 2023.3.0a15
Could not test with: 2021.1.32f1 (feature does not exist)

Reproducible on: Windows 11
Not reproducible on: No other environments tested

Note: Also reproducible in Player