I'm working on some models someone else made as part of a project. The .blend files they've given me have several objects that get no selection outline in the viewport despite Outline Selected being checked. Other objects work normally. I assume there must be something else that can cause an object to not be outlined, on a per object basis.
Can anyone tell me what this might be? I cannot find any differences between the settings of objects that do and don't have selection outlines.