Based on my experience today, it seems the cooldown for these is across all gold plunder types. I don’t remember this being the case.
I was waiting at a delve boss with about 4 other high cp players and I didn’t get a drop the first time, no gold coins or anything. I was distracted by something and hesitated a couple seconds and that was enough. I went to a public dungeon and got a gold plunder skull there, then came back. The next time I got a drop, but it was only gold coins. I had to wait a third time to get a gold plunder skull for the delve.
Is this correct behavior?
PS5 NA