Steps to reproduce

1. Enchant a bow with flame.
2. Shoot at a mob repeatedly. An iron golem or ravager are good for this because they burn and have a lot of hp.

Expected results

All of the arrows hit and damage the mob.

Actual results

While the mob is on fire, some of the flaming arrows pass through it instead of hitting it. They still deal knockback.

In this video, there is a target block under the noteblock behind the ravager, so notes show when the arrows pass through: Arrows through.mp4

If an entity is on fire, when hit by a arrow effected by the 'flame' enchantment, the arrow will instead continue on its original course and the entity will be flung. (works best with spiders)
if the entity in question takes no knockback, (For example an iron golem), the arrow will instead go through it.