The interaction causes in a route failure

Before you can get a useful answer, someone must BOTH have time to look at the thread and the file, AND actually have a useful answer to give you after doing so. Everyone here also has a life of their own, responsibilities of their own, AND also anyone who knows enough to answer modding questions usually has projects of their own too. They'll not likely be more inclined to help someone who complains about no one having answered yet -- you can bump your thread without having that kind of attitude. (The best way to bump your thread, in my opinion, is to add information to it, but even just 'hey, I'm still stumped, does anybody know anything about this?' bumps your thread without making demands.)

I put your file in my game anyway, and I was able to reproduce the problem, but I don't really know anything about posture or ASM, so I don't have any answers for you. However, I can tell you that one of your levels of detail isn't correctly set up to be invisible; the toilet turns black when I zoom out. (It disappears again when I zoom out further, so it looks like it's just LOD1 that has the problem.)