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It's a bug. I'd actually TRIED to stick it into Mantis multiple times during the night, but the site kept glitching out. It finally went through just now. The Bubbles not working had been a complaint I've heard a few times over the last day.
It does get a little irritating, yes.I'm certainly tired of fixing the Warden, that's for sure.
You said they just stood there and did nothing? That's very strange, I tested it recently and they appear to be pursuing as intended.
In recent builds, Terror Bubbles were just sitting there on Normal difficulty and down, because they had no weapons on those difficulties. Fixed! Thanks to Cinth and Nova225 for reporting.
Opened your save. My computer wept. Switched to the ST planet and ship icons filled my screen, so I zoomed out. Game told me that it _was_ totally zoomed out. You could seriously walk from one end of the inner grav well to the other without getting your feet cold.