Object selected but orange highlight doesn't show

Not quite. The deal is that also, only the objects already in the scenes of said project, and only on some projects, have this issue. I can create new objects on the same scene, open certain other projects on the same editor, and I don't have the problem. My belief is that the pre-existing game objects had some sort of weird parameter or whatnot somewhere but the Inspector has the exact same settings as when a similar model with the orange highlight is shown. The best I can really do is to rebuild the entity by reimporting necessary editor tools and assets or directly spawn in objects.