The title kind of explains it all, but basically the exotic weapon, Collective Obligation, cannot and has not been able to leach suppression off of either Shadowshot: Deadfall or Shadowshot: Moebius Quiver. It is able to leach the weaken effect off of both of them, but not the suppression effect. This has been the case since at least January of last year which is when I first noticed it after getting the exotic, but it has become especially annoying recently with the addition of Prismatic since this bug makes hunters the only class unable to leach all three debuffs while on that subclass.