Thanks for the report. Have you observed this only when playing Vodyani, or also for other factions?

I have only played Vodyani so far, haha, so no, sorry!

Although along those same lines (and extra info for the bug), they put a negative singularity on one of my systems and I left it.  The visual stayed for a few turns, but then Horatio put an outpost on it and the visual went away.

I was so excited it was gone (5 planet system) so I went back to take it again only to find that the negative effects were still there but the visual was gone.

Looks like it happens after coming back from a save (after having taken over a system with a singularity), the gameplay effect stays but the special effect doesn't.

hah, half forgot the screenshot possibility (my Mac is 2014, so it's very slow with ES2 and especially when multitasking).

But no, this is single play.