Steps to reproduce:
1. Acquire a sword with the knockback I enchantment and a sword with the knockback II enchantment.
2. Switch all players to survival mode.
3. Hit another player with each knockback sword, and then punch it.
The other player gets knocked back farther when hit with a knockback I sword than with a punch, and farther with a knockback II sword than with a punch.
The other player gets knocked back the same distance (~3 blocks) by a punch and by knockback I and knockback II swords.
Original title and description
Frost walker and knockback enchantments
Both enchantments are not working