Thread:2A02:1810:943E:FE00:7CD1:4CC3:B938:219E/@comment-2A02:1810:943E:FE00:7CD1:4CC3:B938:219E-20180627160044/@comment-3547390-20180630210012

Sounds like you were using some unofficial source port which modified things. The "second teleporter" is supposed to bring you back to the ledge where the first teleporter is, it does not bring you into Shub-Niggurath, no matter how well you time it.