Reproduction steps:
1. Open the attached "FunctionPtrRepro.zip" project
2. Go to Player Settings (File > Build Settings > Player Settings)
3. In the Player tab, change Scripting Backend to IL2CPP (Other Settings > Configuration > Scripting Backend)
4. In the Build Settings, click Build and Run (File > Build Settings)
5. Wait until the built Player is run

Expected result: The Player does not crash
Actual result: The Player crashes

Reproducible with: 2021.2.0b8, 2022.1.0a5
Could not test with: 2019.4.29f1, 2020.3.17f1, 2021.1.18f1 (C# 9.0 not supported), 2021.2.0b6 (case 1356723)

Note:
- Not reproducible with Mono Scripting Backend or in Play Mode