custom advancement trigger not working

{   "display": {     "icon": {       "item": "minecraft:stone"     },     "title": {       "text": "CheyTac M200 Black Gold Camouflage"     },     "description": {       "text": "Progress +1"     },     "frame": "task",     "show_toast": true,     "announce_to_chat": true,     "hidden": false   },   "criteria": {     "camo_m200_killcount": {       "trigger": "minecraft:player_killed_entity",       "conditions": {         "entity": {           "type": "minecraft:player"         },         "killing_blow": {           "type": "minecraft:damage_source",           "direct_entity": {             "equipment": {               "mainhand": {                 "item": "tacz:modern_kinetic_gun",                 "nbt": "{GunId:\"suffuse_m200\"}"               }             }           }         }       }     }   },   "rewards": {     "function": "codmc:camo_m200_scorecount"   } }
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