Huh, I think I received a bug report about this a while ago and I checked to make sure the hide flags were correct, and it looked fine at the time... So I'm not too sure what might be changing the hide flags, actually...?
Since the icon is used on the data components, I wonder if it could be related to some kind of hide flag being applied to that? I'll keep thinking about this but if it's happening in another asset too, there may be some other common thing making it happen. For the other asset, is it also applied to a ScriptableObject?