If you look at the 1st Raider Squad you'll see several missing dwarves who either never left the edge of the map for the raid mission, or never returned. No information is contained in the reports, it's like they just vanished. They also don't appear in legends as having returned, or even taken part in the mission.

https://www.dropbox.com/scl/fi/dpnsrdbgtv6vqqk7t74jy/Screenshot-2024-09-22-132139.png?rlkey=ywhzmkxtdnxyxxfdzu5j2iodt&st=s2n0siqn&dl=0

DF Version 51.01-beta22

DFHack version 51.01-beta (git: 6fe8dfc) on x86_64