LoadLibraryEx() and FreeLibrary()

[Arebusf21]

PInvoke.LoadLibraryEx returns a FreeLibrarySafeHandle:
internal static unsafe FreeLibrarySafeHandle LoadLibraryEx(string lpLibFileName, SafeHandle hFile, winmdroot.System.LibraryLoader.LOAD_LIBRARY_FLAGS dwFlags)

PInvoke.FreeLibrary() requires a HINSTANCE parameter:
internal static extern winmdroot.Foundation.BOOL FreeLibrary(winmdroot.Foundation.HINSTANCE hLibModule);

How can I get a winmdroot.Foundation.HINSTANCE from a FreeLibrarySafeHandle?
or am I missing something?

also;

The 2nd parameter to LoadLibraryEx should be null, according to the documentation. But null throws an exception:
throw new ArgumentNullException(nameof(hFile)); winmdroot.Foundation.HINSTANCE __result = PInvoke.LoadLibraryEx(lpLibFileNameLocal, hFileLocal, dwFlags); return new FreeLibrarySafeHandle(__result, ownsHandle: true);

Using VS2022, v17.4.3, .Net 7.0, Windows Target OS 10.0.20348 Console App. and Microsoft.Windows.CsWin32 0.2.164-beta

See Program.cs
EnumerateResources.zip

[AArnott]

LoadLibraryEx is emitted twice: once with a SafeHandle return type and once with HINSTANCE as its return type. It is only necessary to call FreeLibrary when you use the HINSTANCE returning overload. When you use the SafeHandle overload, you should just dispose of the SafeHandle when you're done with it, and it will call FreeLibrary on your behalf.

The null-throwing issue you found is a bug in the metadata, which I've reported for you in microsoft/win32metadata#1421.