weightless items, like AI cores, nanoforges, survey data and blueprints still get lost on ship destruction.
not ever entire wipe, just lost "cargo" ship (due to stupid "retreat" button, that do not tell in advance will other fleet chase you or not and do not allow to review decision) with 5 beta cores, half gamma cores and entire collection of survey data.
nanoforge survived this time, still.
"normal" cargo also lost, but unlike rare drops, can be recovered at any station.
flagship intact, just stupid pirates swarmed cargo ship with entire deathball ignoring combat ships, it's so hard to befriend pirates.