How can load references dll still using MemoryLoadLibrary

[jeffjiang0613]

I have a library named a.dll, a.dll has a reference b.dll.
When I want to use MemoryLoadLibrary to load a.dll, the default references loader is LoadLibraryA, when I changed the loader to my own loader like the code below, it crashed. How to change the return value of MemoryLoadLibraryEx to a value like the return value of LoadLibraryA?

HCUSTOMMODULE LoadLibrary_R(LPCSTR filename, void* userdata)
{
      bool isFound = false;
      for(auto it: names)
      {
          if (strcmp(it, filename) == 0) {
              isFound = true;
              break;
          }
      }

    if (isFound) {
        size_t size;
        auto buffer = readFileToBuffer(filename, &size);
        auto t = (HMODULE)((PMEMORYMODULE)MemoryLoadLibraryEx(buffer, LoadLibrary_R, _GetProcAddress, _FreeLibrary, NULL))->codeBase;
        //still wrong
        //auto t = (HMODULE)MemoryLoadLibraryEx(buffer, LoadLibrary_R, _GetProcAddress, _FreeLibrary, NULL));
        return t;
    }
    else {
        HMODULE result = LoadLibraryA(filename);
        if (result == NULL) {
            return NULL;
        }
        return (HCUSTOMMODULE)result;
    }
}