Silly autocast behavior is quite prevelent in this game. Just off the top of my head I can think of five other abilities that have this problem: gravity warhead will target ships that aren't even moving, malice will activate even when there's only one target, clairvoyance will be cast on planets that already are revealed by clairvoyance or lingering presence, scramble bombers will activate in plasma storms, detonate antimatter will target ships that have already depleted their antimatter, and these are just the obvious cases.
It's so bad that there's only a short list of abilities I even consider turning autocast on for. For abilities like embargo, it's best to turn on autocast when you enter a well you want to embargo and turn it off once you leave.
