Help regarding Potion "Set NBT"

I recentley new that Minecraft has removed the set NBT so can andyone tell me if they just changed the name or something else.. custom in Loot tables. This is Loot table.. { "type": "minecraft:chest", "pools": [ { "rolls": { "min": 1, "max": 1 }, "bonus_rolls": { "min": 0, "max": 1 }, "entries": [ { "type": "minecraft:item", "name": "minecraft:lingering_potion", "weight": 1, "functions": [ { "function": "minecraft:set_count", "count": { "min": 1, "max": 1 } }, { "function": "minecraft:set_nbt", "tag": "{"Potion":"minecraft:long_fire_resistance"}" } ] } ] } ] }