Yeah these nades arent the only ones suffering from this. Sticking someone with a tripmine and they survive. Scorch someone, they get burned but no melee damage (as the vid also shows, sometimes they are right on top of the nade, nearly killing them only requiring a single shot to finish them off, sometimes it hardly deals any damage at all, even tho they sit on top of it). Strange thing is, it does register the hit (as apparant in this video by that red "surpressing" cloud above their heads) but the effect seems to simply fail. Just like when i scorch someone, they do get burned (so the hit registered) but no melee damage (wut?). Or the other way around, i deal melee damage, it depletes my melee, but no burn. Applying such effects and burns does not seem to be very stable.