LEAVING TEMPLE = LOSE TEMPLE AND MAP

Just exited temple to get some scrolls and vendor, couldn't re-enter, and couldn't go back to map. Go to hideout, map gone. Guess I should just go back to not running this dogshit content.

I had a similar issue. I entered the temple from a corrupted nexus map, finished the temple and walked out to find that the map had been deleted. Returned to hideout, portals gone, map gone, corrupted nexus lost. Feels real bad.

Apparently, being in the Vaal Ruins counts as "leaving the map" and so maps can expire while you're inside the temple. Just happened to me. Lost the temple, lost the map. Still had portals left, too. Nothing like a league mechanic that incentivizes you to build a grand temple that takes longer than 15 minutes to do just to have your map deleted because you're in the temple for over 15 minutes.