Reproduction steps:
1. Open the attached project "1314326"
2. Open scene "Game"
3. In the Inspector, select "Tilemaps" > "Ground" and enable the Game Object
-- observe crash

Reproducible with: 2019.3.0b2, 2019.4.20f1, 2020.1.0a2, 2020.1.17f1, 2020.2.6f1, 2021.1.0b8, 2021.2.0a6
Not reproducible with: 2018.4.32f1, 2019.3.0b1, 2020.1.0a1

Note:
- Assertion failed on expression: 'spriteIndex < tileSpriteArray.size()' is printed in the Editor log right before the crash

- Issue might not have regressed in 2019.3.0b2 and 2020.1.0a2 exactly. With 2019.3.0b1 and 2020.1.0a1, the project crashes when trying to open it with the following stack trace:
0x00007FF75B822863 (Unity) AllowImportingV2
0x00007FF75ADBC94C (Unity) Application::InitializeProject
0x00007FF75B6F8AA8 (Unity) WinMain
0x00007FF75E6E6C72 (Unity) __scrt_common_main_seh
0x00007FF8C6CE7034 (KERNEL32) BaseThreadInitThunk
0x00007FF8C7B9D241 (ntdll) RtlUserThreadStart

- With 2018.4, 2019.2 no crashes occur when working with the affected Scene