Have you ever seen butter attract butterflies?

Another question reminded me of an old question I had.

Why are butterflies called butterflies?

A quick Google search pulled up various entomological examples of how they were known to be attracted to butter or lick milk. (Milchdiebe or milk thief in German.)

I cannot, for the life of me, recall any such incident.

Have I just never seen this before?

Or is this just a myth? If so, how in the world would it have originated?

Or is it that much of the butter today is so processed (versus fresh hand-churned butter), that they’re no longer attracted to it?