[v19 stable hotfix] Invisible Aliens

Here I've got one of those alien flying discs (what are they called?) that I know is there, but I can't see it:

I had seen it on a previous turn, and I can kill it, it's just invisible.

Seconding this, as of last night I've seen two separate missions featuring intermittently invisible Light Scout Drones. They seem to be invisible if spotted during the player turn, then become visible if they move on their own turn while under surveillance. "Alien sighted" indicators are unaffected, and the shadows underneath the invisible drone show correctly as well.

Usually i have this invisible Drones bug if i load saved game. In this case even ones that were perfectly visible when you saved game became invisible after i load that save.

SoftwareSimian did you loaded a ground combat save earlier? I've reported Newfr's bug, but I would like to know if there is another issue I should be worried about

I can't be 100% certain, but it's 90% likely that I had loaded a saved game, yes.