I don’t recall this happening before the recent patch(es), but it may well have. In any case, I’m not sure it’s a bug or intended, but I think allowing white mobs (rabbits, racoons, etc.) to trigger Ranger and Thief traps is…hmm…unfair? Ill-advised?
Lately, more and more, I’m finding myself wasting traps routinely when dropping them only to have them trigger almost immediately due to an unnoticed rat scurrying or bird flying over them. Seriously, this is silly. Traps are, by and large, tactical devices that shouldn’t be lost, by design, to wandering ambient critters…and some areas have a LOT of these little guys running around….
I realize white mobs are included in weapon bouncing effects, and this may be connected to that, but it couldn’t be a difficult task to include an exception for traps.