It seems that the act of double-clicking within text (Typography, Text, etc) to get an insertion point causes the application’s “edited” state to be raised (black dot in the red close button, top left) when you leave the component (click outside it again) without actually having edited anything.
Is this deliberate behaviour or a bug? I think the latter, because the editor should know if anything has actually changed at the point you deselect the component - just setting the insertion point is not an edit. Either way it is irritating!