How to reproduce:-

1st way-

1: Wear a full set of unenchanted netherite armor.

2: Summon a iron golem using /summon iron_golem

3: Go to survival mode and attack the iron golem.

2nd way-

1: Spawn a zombie/zombie villager. 

2: Give the entity a netherite sword with the enchantment knockback 2.

3: Go to survival mode.

Observed results:-

When the iron golems/zombie hits the player the netherite armors knockback res is too much. 

Expected Results:-

Knockback res shouldn't apply to iron golem punches and knockback enchanted weapons.

NOTE:

This is not a duplicate of MCPE-77430 because, that bug report states the parity issue of not matching. Which was said to be fixed in 1.16.200.53.

Visual representation of the bug is provided.