MissingFieldException when assigning to a function pointer field

[kostya9]

Trying to use a field with function pointer type throws a MissingFieldException in runtime.

Repro steps

Provide the steps required to reproduce the problem:

1. Create a new F# console app
2. Add TerraFx.Interop.Windows package

<ItemGroup>
  <PackageReference Include="TerraFX.Interop.Windows" Version="10.0.20348" />
</ItemGroup>

2. Use the following code:

open TerraFX.Interop.Windows

let mutable windowClassDescriptor = WNDCLASSEXW()
windowClassDescriptor.lpfnWndProc <- 0n // lpfnWndProc is of type delegate* unmanaged<HWND, uint, WPARAM, LPARAM, LRESULT> in C#

printfn "Successfully Finished" 

Zip with repro:
MissingFieldExceptionRepro.zip

Expected behavior

Program finishes and prints "Successfully Finished"

Actual behavior

Throws exception

Unhandled exception. System.MissingFieldException: Field not found: 'TerraFX.Int
erop.Windows.WNDCLASSEXW.lpfnWndProc'.
   at <StartupCode$MissingFieldExceptionRepro>.$Program.main@()

Known workarounds

No workarounds known to me

Related information

Provide any related information (optional):

• Operating system: Win11
• .NET Runtime kind (.NET Core, .NET Framework, Mono): .NET 6, SDK 6.0.100
• Editing Tools (e.g. Visual Studio Version, Visual Studio): Rider (and command line)

Here is the definition of the field in the TerraFX repo. Commenting out the assignment fixes the problem, but the field is required.