Vinktar Square, cant enter boss room with 0 monster remain

Hey all,

Bug Report No: 1 351 541 561

So i was doing Vinktar Square map.

Killed the 4 outer bosses, tried to open the gate (worked) but i couldnt enter cause some invisible obstacle is in the way (check image).

Killed the rest of the mobs and now have 0 monster remaining.

5 Portals left for the case it matters.

still cant enter and cant kill the avatar boss.

did i oversee something?