Warden's melee attack does not deal extra knockback

When the Warden does a melee attack, it is supposed to have extra knockback, sort of like it's sonic boom attack does. On Bedrock this does not happen and the Warden deals the same amount of knockback as other mobs/attacks do.

Step to Reproduce:
1. Spawn an Warden
2. Spawn a Snow Golem
3. Wait for the Warden to hit the Snow Golem

Expected Result:
The attack knocks enemies back a couple of blocks

Observed Result:
The attack only knocks enemies back one block