ToME: the Tales of Maj'Eyal

Upon exiting the volcanic caldera, the location disappeared (which I think is how its supposed to be) but the strange cave containing the 4 glyphs/portal also disappeared on my map? Is there any way to get it back or is this intended too?

Neither Volcanic calder or the WAy to Strange portal should go anywhere. This sounds like a case of world map file corrupting and getting regenerated in "default" state