whenever I assemble a structure it goes invisible, and works weirdly. after assembly, it can't be accessed in any way, though it still detects a structure in its place. The only way to interact with it is by walking into it, and it will freeze the player in place with the only way to get out being teleportation.

1.18.2 Forge

This sounds like a mod incompatibility, please identify the mod that is causing this issue, launch the game with only eureka and that mod installed, and send your .minecraft/logs/latest.log file here.

I had the same problem, disabling Optifine fix it.

Optifine is not supported in 1.18+. Disable Optifine and re-open this issue if you still have problems. Rubidium/Oculus is recommended for shaders on Forge.