I don't know if it's intended or not, but right now if you kill enemies with Trinity Ghoul's Lightning Rod perk, they don't count towards the kill counter on the bow.
-
Edited by EckyThump: 8/29/2020 4:03:31 PMIt's a known issue, on the tracker. https://www.bungie.net/en/Forums/Post/256877165?sort=0&page=0 "The masterworked Trinity Ghoul exotic bow is not tracking enemies defeated using chain lightning damage."