my advancement isn't working, and I can't figure out why

I just wanna make the advancement be achieved when entering one of the three custom structures, like it does for end cities
{     "display": {         "icon": {"id": "minecraft:shulker_shell"},         "title": "Creative Endgame",         "description": "Just another beginning",         "hidden": true     },     "parent": "minecraft:end/enter_end_gateway",     "criteria": {         "trigger": {             "trigger": "minecraft:location",             "conditions": {                 "player": [{                     "condition": "minecraft:location_check",                     "predicate": {                         "structures": ["31end:end_lab", "31end:end_dungeon", "31end:end_country"]                     }                 }]             }         }     } }