This is my third world that this issue happened. I gathered all ingredients to build the Incomplete Experiment then i built it, but i can't place it. It appear invisible someway and i can't go to the next step. I'm tired of gathering all ingredients to came here and discard them to use commands to spawn the Celestial Champion. Please, can you help me resolve this issue? Let me know if you need any game log file.
Just buld a Incomplete Experiment and try to place it. I can't do it. My world and cave settings are in default mode except for disabled wildfires and add some extra resources.