How to reproduce:
1. Open the attached Example 2.zip project
2. Open the Sample Scene and inspect the errors in the Console window
3. Enter the Play mode and inspect the error in the Console window

Actual: Errors are thrown in the console window

Reproducible with: 2019.3.16f1, 2019.4.3f1, 2020.1.0b16, 2020.2.0a18

The errors:
- Error: Could not load signature of System.IAsyncDisposable:DisposeAsync due to: Could not load file or assembly 'System.Threading.Tasks.Extensions,
Version=4.2.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. assembly:System.Threading.Tasks.Extensions, Version=4.2.0.0,
Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51 type:<unknown type> member:(null) signature:<none>

- Unloading broken assembly Assets/NuGetPackages/Microsoft.Bcl.AsyncInterfaces/Microsoft.Bcl.AsyncInterfaces.dll, this assembly can cause crashes in the runtime.

In the Play mode:
- TypeLoadException: Could not resolve the signature of a virtual method
System.Runtime.CompilerServices.AsyncVoidMethodBuilder.Start[TStateMachine] (TStateMachine& stateMachine) (at <fb001e01371b4adca20013e0ac763896>:0)
Main.Start () (at <d3a973bcf5024ad394f7284204b5713b>:0)

Notes:
- Could not test earlier versions because project breaks when downgrading