The hullmods are currently set as mission rewards. White Whale should drop 3, while the rest should drop on either Diamond in the Dark or Gaining Vantage. The flagships for each mission should be guaranteed salvageable, but will occasionally end up as a storypoint salvage due to a quirk of magiclib. The Mimesis (P) escorts are not guaranteed drops but you should receive a blueprint upon mission completion (see here) so you can build them yourself, while the Azure Fire should be a unique guaranteed salvage. The Lampetia encountered in the mission should be salvageable, but it's a stock Lampetia that can be rarely encountered among Remnant fleets. The big reward for that mission should be the Advanced Terminator Core hullmod that can be fitted to any Lampetia or Odyssey (TT).
If none of the new hullmod specs or blueprints are dropping upon mission completion, that is a pretty serious bug. I will do some more testing on my own, but if you could post an image of the post-battle salvage for any of the missions just to confirm they're not dropping, that would be a big help too.
I definitely didn't get the Mimesis(P) BP or any of those hullmods after the battle. I don't have a save to redo that battle again, but I did have one with Diamond in the Dark active, fought that again and
here is the end of battle drops for both ships(No Lampetia) and items(first one default, second filtered to Other only so the the full list of those items are visible).
Full disclaimer though, I am running quite a few mods, including some bootlegs/version-number-changed ones. However, most of the mods and especially Nex and the assorted library mods should be the latest official releases with a clean folder install.
But it's possible that it could be something broken on my end from
ill-advised modifications. If so, I could always just console command in the relevant rewards.
For another minor thing, just noticed that the 0.1.2 files still indicates version 0.1.1 in the mod_info.json file.