3.50 beta (not sure if it's 1 or 2)
I've had one light lever trap and one bear trap getting triggered but remaining erect (i.e. the "weight" not fallen down). In the case of the bear trap I found a rotten elk carcass two tiles away from the trap (obscured by a tree), and naturally assume the elk had been mortally wounded by the trap, escaped, but died from its injuries shortly afterwards. Since the trap was still erect it took a long time to notice it had actually been triggered, as the red active trap indication is hard to see when it's dark.
It can be noted that I've definitely had animals escape from bear traps (a bear and a reindeer), but in both of those cases the traps had collapsed as expected. Since I haven't encountered escaping victims in prior versions (except for Njerps), I find that a very nice improvement.
I don't have any save of these erect triggered traps, though.