The fire ball that is shot by blazes doesn’t deal any knockback. This is also related to
MCPE-56212 where the thorns enchantment doesn’t deal knockback. I can confirm that on java editon you do get knockback by the fire ball.
How to reproduce:
- Spawn a blaze
- Switch to survial mode
- Wait until the blaze shoots at you
Expected result: You get knockback when the fire ball hits you.
Actual result: The fire ball didn’t deal any knockback.