"Puzzle Room Reset"
"All puzzle room loot is destroyed before respawning - no half looted boxs"
They heard you, Reddit.
What minimum map size must you be on to have tunnels please? Smaller types don't have it, obviously. IIRC Launch is now 3500 minimum. Tunnels?
There isn't a minimum, long as the world has space to spawn the monument. You should be fine going down to 1500.