Crypt Map - Unreachable Rare Mobs

A crypt map I ran had an unreachable area in the center of the map with 2 rares.

Same here just happened

Same. There's a path with a door or something that i'm unable to open.

EDIT: after further inspections, there's a switch on the column in front of the visible path in the map, but you have to fiddle with the mouse, as the label with "switch" name does not appear until you hover the mouse over it.