I'm trying to combine two meshes together and am running into some really weird issues. My combined mesh has all these jaggedly shaded faces, vertices I can't select from certain angles and interrupted or dotted edge lines. What's going on? I already ran Merge Vertices By Distance and Flip Normals and the problem persists.
Please ignore the combination of tris and quads and how much of a mess the rest is (unless it has something to do with my issues), I'm intending to go in and fix the topology later once these issues are resolved.