This bug works on any place with 2 floors.
It is pretty weird when it does it but here it is:
>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>>>>
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First part of the bug, the red flag (showing where it is going to go to, shows in the blackness)
When you get upstairs it runs the same path as it would downstairs. If the doors are closed it dosen't follow the path.
Example:
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Note: this is just a start on me trying to find a noclip or anything useful.
Thanks.