New Ritual map bug after 460hours played

Was running a map with Ritual Altars. After completing 3 and finding the 4th, I was DC'd before i could begin it. When I got back in the game, I ran around for a few mins trying to find it when it suddenly activated on it own with a bunch of mobs already present. I died, so there goes all that exp (lvl93).

Never seen this automated start before.

Pro: Found it faster than expected
Con: I got rekt while unprepared