Bricked unique maps messing up map stash UI

Repro:
* Get a bricked Olmec's Sanctum that was vaaled to 8-mods while keeping the art (not sure whether normally achievable, but mine is from the sextant mod "Map dropped has 8 mods")
* Dump it into map stash
* Map then is nowhere to be found (not in this tab or unique map tab), and the icon of this normal tab changes.