i'm having issues with custom content not exporting the way it looks in tsrw. the textures and uv gets all messed up. i included wrk and package files if anyone could have a look at what could possibly be the cause of the issue?

Looks like the material properties are broken / have been edited in a way that the object you cloned doesn't support. There are a lot of mismatched textures going on in there that don't all belong to this object, too. As well as the Mask being made blank- this should be replaced with plain black and simply disable the patterns if the item won't be recolourable, but textures should never be removed.

It works fine if I import the mesh and textures into a new clone, looks like you may just need to start fresh in a new project
If you need to use Material textures, I'd recommend starting with a cloned object that already works that way- like an existing prop or building shell.