It’s doing the right thing - most of the harm has been done with the battery being charged up in the first place. If you can pull power from the wall instead of battery, do it. Ordinary usage will chip the battery down to the charge limit in due time.

I have an ASUS laptop which does not do this. When you turn on the battery limit, it stops pulling power from the wall until the battery is down to the right place. Very rude.