[0.3.1] Creek Map Boss Arena & Portals

After defeating the creek map boss, the game won't let me use summon portal within the bounds of the Arena, hovering over the portal icon, the tooltip states that portals are disabled in boss fights. Since I can portal out normally once I leave the boss arena, this is most likely a kill flag not being applied correctly.

Not a problematic bug, but I thought I'd report it nonetheless.

I had the same situation in crypt after killing the boss once. Had to exit the arena to use the portal.
It doesnt always happen since i killed it multiple time there and only had the issue once.