Simulacrum bugged, locked at the previous area

It happened the simulacrum panel was overlapped with town portal, when I clicked and the next wave started, I went to town at the same time. Once I came back to simulacrum, I was locked in previous area. I can kill the monsters by ranged attacks but cannot continue the waves.

I lost 150 splinters and a Visions of Paradise Tablet which unfortunately dropped in the next area I cannot enter -_-