What is wrong with my enchantment?

[dry heath]

It is supposed to add more knockback when crouching, but apparently it does nothing...

{
"description": "Crouch-Knockback",
"supported_items": "minecraft:diamond_sword",
"slots": ["mainhand"],
"weight": 100,
"anvil_cost": 0,
"min_cost": {
"base": 1,
"per_level_above_first": 0
},
"max_cost": {
"base": 10,
"per_level_above_first": 0
},
"max_level": 3,
"effects": {
"minecraft:knockback": [{
"effect": {
"type": "minecraft:add",
"value": {
"type": "linear",
"base": 30,
"per_level_above_first": 200
}
},
"requirements": {
"condition": "entity_properties",
"entity": "this",
"predicate": { "flags": { "is_sneaking": true }}
}
}]
}
}

[warm onyx]

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[dry heath]

if I turn it to damage instead of knockback it also doesn't work... is there a progblem with the condition?

I have that text from a video that was before 1.21.5, might that be the problem?

when changing the entity from "this" to "attacker" it works, I hope that that is the right solution and doesn't give other entities which attack this one an attack boost