Map ping changed?
Maybe because some people used it a lot to spam the map, they were so large that when you started to ping rapidly other people could no longer see the map.
If I remember correctly some people used this somehow to confuse players in PvP. A few times I came into a match where I could no longer see my map at all from the infinite spam of those red pings.
I wish they gave us a way to change the keybind for that option though. I don’t want it to be shift.