With the next patch for Destiny 2, Dragonfly will be removed from all Cold Front weapons to prevent incorrect weapon interactions.
Reported in December 2020 Reddit user dead_is_death
That caused some issues that ultimately led Bungie to remove this perk in an upcoming patch. Bungie’s Assistant Director for Destiny 2, Joe Blackburn announced this on Twitter to explain the decision:
“Wanted to give a quick update on Coldfront. The Dragonfly perk was not designed for use with kinetic weapons and causes some technical errors. For this reason, all cold fronts with the Dragonfly perk will be replaced by the Swashbuckler perk in an upcoming patch. “
Swashbuckler is a legendary ability that causes the weapon it is equipped on to take increased damage from melee kills and kills with the weapon.