System.EntryPointNotFoundException: SteamAPI_Init

I cannot get Steamworks.NET on Unity 2022.3 to work as initialisation fails. Digging around, it seems it cannot find the entry point even though the DLL appears to be successfully loaded. I'm not sure if SteamAPI_InitFlat is being used here, but Steamworks.NET 20.2.0 using SDK 1.57 works mostly fine whereas SDK 1.59 and beyond seem to perform initialisation differently for non-c++ projects..