I have this tree that I modeled in Blockbench that I wanted to use in my game with a multimesh instance, so I exported it as a .obj file. However once I'd imported it I wasn't able to edit the materials to switch the filter from linear to nearest. I've already tried changing the default in the project settings and the compression mode for the texture it's using but neither have worked. Originally I was using .gltf models that would easily let me save the materials to file to edit them, but this doesn't seem to be an option for .obj's.
Also I'm not sure whether or not the filter is causing this, but the transparent bases of the cone objects I used for the trees leaves are now mostly black with some bleed from the truck.
