once the "name" of a layer of an instance or the main-component has been renamed (aka broken) manually, any future re-namings of the main-component or its "broken" layer will not be executed in the instance.

this is understandable.

to reset an ENTIRE element XD has the "reset to main-component" feature - which is great.

MY IDEA:
similar to the feature where you reset line spacing by entering "none", there could be a re-set of the name / re-link to the naming of the main-component by entering a "none" as the layer name.