Bp nativization and custom structs crash on build

I’m using quite a few custom structs and enums. I like to use bp nativization to compile a heavy on math and code bouyancy system. I’m using exclusive method and have only said bouyancy system selected. However, as I read this method or any other method other than disabled also includes enums and structs. Of which I have a lot custom made ones. Sadly, these custom structs cause crashes when the package is built (after being nativized).

is there a way to exlude structs and enums from nativization? Thing is my custom structs use class variables, which seem to be the core of the problem. Any other kind of variables seem to be fine. But class types when nativized can’t be read or something after breaking the nativized struct. Why is this? And is there a way around it?