I was ready to test out some base design concepts in the battlescape maps when I discovered that the retaliation missions aren't operating. I know they were previously, in fact it was only a couple weeks ago that I easily spawned a retaliation mission in a fresh game and confirmed that my new large scout retaliation works properly. But now it's not spawning at all and I can't find anything in my code that should be the cause of this. The only changes I can think are related that I have made since then are that I added the hunter-killer mechanic to existing UFOs, I added elite UFOs (which do not spawn yet), I added new deployments which are not yet used, and I have added some aliens and armor suits.
In the copy of my mod below, I have two research retaliation missions set to 100% spawn rate if you research alien alloys, elerium-115, UFO power source, and UFO navigation, and I have decreased the time it takes to research them. I'm also attaching a save file which should easily be able to spawn the mission. I also increased the radar range, so you can clearly see that the retaliation mission never spawns in the first place.