Start GM mode
activate a faction
create a spawn point for the faction
put down the arsenal crate for that faction
spawn in as a character of that faction
grab anything from the arsenal and put it in your pants and/or jacket
die (e.g. by lightning striking your character or with an HE grenade)
go through the respawn menu and select your saved loadout
spawn in
check content of pants and jacket

This is especially infuriating because there's a difference between how pre-configured loadouts are stored (prefabs aka weird non-json files) vs how arsenal-saved loadouts are stored (difficult to read json) with the first one working flawlessly and the latter being broken.