So, I discovered my first alien ruins and sent a xenology team (160-ish skill), who uncovered 14 installations after a few years. So, I sent in a construction brigade (158 morale, 40% commander) to dig them up, and they were uncovering once a tick. Found mercassium, then 8x 500 salvage modules, then 40x compressed fuel tanks. . . Then nothing. Still sitting at 11 installations a few months later.
Even weirder, the salvage modules showed up in the colony stockpile, but the fuel tanks didn't. I can't find them anywhere, and was really looking forward to getting that tech. Am I missing something, or am I bugged?