Mirror templates.

The problem is that the same monolith on one plane is a single-cell structure, while on another it's a two-cell structure (with an impassable cell to the right of the entrance). And this impassable cell can, for example, block a passage (or, conversely, the absence of an impassable cell can open a bugged passage), which will create a significant difference between the planes. That is, it is also necessary to synchronize the presence of an impassable cell in the monolith.