Summary:
Players wearing armor take less damage from burning when standing in fire.

This bug also existed in Java Edition and was fixed in 1.16 Pre-release 3: MC-171618.

Steps to Reproduce:

1. Equip a full set of diamond or netherite armor
2. Light a block of netherrack on fire
3. Switch to Survival mode
4. Stand in the fire
5. Observe how much damage the player takes
6. Move out of the fire
7. Observe how much damage the player takes

Observed Results:
The player takes less burning damage when standing in the fire.

Expected Results:
Players standing in fire should take the same amount of burning damage as when they are not standing in it.

Videos:
Bedrock:
Minecraft 2022-02-11 11-48-49.mp4

Java:
Minecraft 1.18.1 - Singleplayer 2022-02-11 12-53-10.mp4