https://bugs.winehq.org/show_bug.cgi?id=51821
--- Comment #2 from algebro@tuta.io --- Forgot to add that Wine DOES load the module successfully when being ran from the same directory, so it's not an issue with Wine just refusing to load it:
SharedCache sisi bin64 wine ./LoadLibraryTest.exe Full path name: C:\EVE\SharedCache\sisi\bin64\launchdarkly_client.pyd Attempting to load launchdarkly_client.pyd Module loaded successfully