When there are more than one map wall with the same big map but they are kinda far away only the one that the map (item) was taken will refresh. The far away one won't refresh. Before 1.16 both maps on the walls were refreshed.

Example: I have a region map wall and a world map wall on my creative map. When I make a copy of the map with the roll button on my mouse I get a copy of one of the maps that are on both map walls but when I refresh the map just the one that I copied will refresh, not the other map (exactly the same one) that wasn´t copied. On older versions both refreshed.