@Nils Hörrmann My way of thinking was too complicated, I’d prefer an “unread dot”, it should be well-suited for that purpose. Just 2 quick mockups, how this could look like. I like the idea with the orange outline, because it makes it way more obvious when scrolling through a long panel view, but the big drawback is, that it won’t work with any field design (e.g. structure, editor) and adds too much visual clutter to the UI.
A nice bonus would be, if that little dot was clickable, showing a confirm dialog and (in the future) could also show a diff between the old and new value of that field.