Losing Overrides: »When you both move and change a component [...]«

Hey, I try to move a component from a library to another. After cut/paste the component to the new library I get the »Move Component«-Dialog. But there is a little notification on bottom of the dialog modal that informs me about losing overrides. And indeed, the overrides in connected instances are gone after publishing. But I really don’t know what is meant by »both move and change«. No other changes were made before or after the move… Everything was updated before the move.

Does anybody know what is happening here?

Update: If I copy the component to another library, publish it and reconnect the instances with the newly published component, all overrides are preserved.