We have had this issue for quite a while - when selecting one object and applying a new material on it, or making the material unique and modifying it, all the objects with the original material change as well.
I cannot change a single pane on a kitchen facade without other kitchen parts turning green.
Is this a bug? I have seen a similar post on the forum, but it was from 2018 - and the problem was fixed back then.
I would really appreciate your help or comments, this is putting me in a difficult situation for my presentation!