Many users have been noticing a change in the Google Maps Local knowledge panel! It seems that Google has updated or testing the Google Maps Marker this week since now it looks like a circle pin rather than the typical marker pin icon.
A user on Twitter mentioned that Google uses the circle pin when the location is a SAB and the address is hidden. We have not heard from Google about this change yet but we will keep you updated! In the mean time check out other Google Maps updates or see how to edit or add locations on Google Maps!