Faulty Vaal Foundry Essence Spawns

I've had a map where two Essence monsters spawned in the Vaal Foundry boss arena. Fortunately one wasn't overtaken by the solid gold wave from the Boss.

One essemce boss was spawned in the Vall foundry boss arena.

Map boss was already dead, then i started the fight with the essence monsters/boss. And then my game crashed (like multiple times every day).

Logged in again, ported to the checkpoint near the map boss. And here i am: i cant enter the arena, and i cant use the sluice gate lever again.

No chance to finish this map.