Very few of you will know why this is important.
...So I'll tell you! The boss teleporter object is disabled offline, so even if one is placed in a mission, it will not appear. One small exe tweak and here we are. One more roadblock in terms of online missions successfully cleared!
(Another small change will make the "seq.is_online" call in the various script files return "true" in all situations, which makes the warp crystals show up more reliably... although they'll crash you if you try to use them to return to lobby in the offline missions, sigh.)