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Ahhhh, that makes sense.  Yeah, it's probably custom DECORATE stuff.  Here are the X/Y coordinates for one example from E5M3, confirmed it just before writing this post:

X: around -13500

Y: 10000

Which episode 5 is this? The Lost Episode or...?

Sorry, yes, "Out of the Aeons" in Strange Aeons, https://www.impie.drdteam.org/SA%20Download.zip