Several of the corner pieces and doorways are strictly one-sided, asymmetrical, such as a few of the corner wall pieces, and the angled doorway, and as far as I can tell there’s no opposites to these, nor a way to mirror the object. This makes using them very difficult, as they only work on asymmetrical maps, and only on one side of said map.
Am I missing something? Are there secretly opposite pieces or a way to flip the objects? This is really frustrating to deal with, would love a fix.