Forgotten Riches Won't Grey Out

As per title, Forgotten Riches in Act 1 for Mausoleum of the Praetor won't grey out. Everything else including POIs and Bosses are greyed out on the world map but the Forgotten Riches node has not gone grey. I have looted it 2 times and got all the gold. I don't know if I'm missing something or haven't interacted with something or if it is a bug, hence bug report.

I have done this both times in multiplayer so if I need to personally interact with the switch, then that might be it.

If not, then this is slightly annoying lol.