Loot is the same in evry structure

My problem is the way that loot is generated because the loot table work fine, but when i make my own structure and every structure have the same loot. What i need to do to generate loot  in my structure ?

Here what commands i used:

setblock ~ ~1 ~ minecraft:chest{LootTable:"cool_things:chests/loot"} destroy

data merge block ~ ~-2 ~ {LootTable:"chests/loot"}(This even don't generate loot)

/give @s chest{BlockEntityTag:{LootTable:"cool_things:chests/loot"}}