So just heads up to my fellow Foundry authors, it seems that there is a draw region* attached to the transporter room. Now this shouldn't impact custom interiors, but it'll cause some objects to disappear on premade maps while you're around or in the transporter. This draw region also is active whether the transporter room is set to invisible or not. If you're trying to transition the transporter out, you may run into issues that need to be creatively worked around.
* A draw region (viz region or any number of other names) is a volume that environmental artists put into a section of a map. When a player is inside this region, it tells the renderer that everything outside of the region can be drawn at reduced detail or not at all. This is used to reduce the graphics load on the client machine by letting the renderer know that when a player is in a specific area, they can only see that area.