Leaf portals saw into leaf.
I have a few of these errors in a map that was compiled with a fast compile in Zoner's 17p.3. These items have never had this corruption before and I haven't done any adjusting or moving to them... and they look fine. They weren't created by VM, by the way.
I know there's no way to know for sure without doing it, but will this error disappear during a full compile? This is more of an FYI question for me about what happens during a full vs. fast compile. And, also, in the batch compile program, you can leave the fast AND full compile unchecked. Will you get any VIS compiled that way?