Enharmonic changes only propagate from score to part, not the other way round. There is no way to tell anything changed, I’m afraid, which also means that once the enharmonisation of a note has been modified in the part, it will not follow any changes from the score anymore (even if the original change is undone). If the note has been ‘touched’, apparently it got some special property, which you can’t see. Mention of the change in enharmonisation in the properties panel, along with a signpost (which you can delete) would be quite welcome.