Cannot activate ritual altar

Couldn't activate the last ritual altar on Channel map overrun by abyss.

The last altar was in the room with sarcophagus where when you open it stone warriors around it become alive and attack you. Also the same room had an abyss in it. For some reason, BEFORE opening sarcophagus the stone warriors were walking and moving (probably some weird interaction with abyss, most of them were green i think), but couldn't be attacked and didn't attack themselves.
If I could guess, some of them moved from the sarcophagus activation range and didn't became alive after I opened it, but they were still in the range of ritual altar, so they've blocked it.

Bug ID 2258375795.