Could it be a one-way warp point? These are easy to make in the map generator by accident, but I have heard that sometimes - just sometimes - they can be created by the map generator.
I don't know if they'd be identified as such though. Can anyone say what a 1waywp looks like? Has anyone seen one generated by the game? (rather than the map editor) Do they differ from "artificial" ones in any way?
If it's a bug, perhaps it's something to do with that new facility to prevent warp point opening / closing.
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SE4 Code:
L GdY $ Fr- C- Sd T!+ Sf-- Tcp-- A% M>M+ MpD! RV Pw Fq+ Nd- Rp+ G-
/SE4 Code
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