The Ravager mob is supposed to resist 100% knockback 50% of the time. The best way to see this bug is by going into creative mode, spawning a ravager and then hit it about 20 times and you will see that it never resists knockback from the player.
Comments 2
See MCPE-56846
Ravager and Zoglin knockback resistance is broken. Including Android systems. I check their json file and iron golem's. Seems "minecraft:knockback_resistance" only working for integers (1) not decimals(1.0)