Male Necromancer monster made entirely out of '?'s

[Former user]

• Opened a closed tension room (CoC 6)
• Inside the room there's a monster made of '?'s (Male Necromancer)

This issue was already mentioned in the steam forums by me. Biskup mentioned the male necromancer spawning was the bug itself, so I'm classifying this as a game logic bug instead of a game graphics one.

Savegame attached.