Small fireballs and dragon fireballs are not deflected upon hitting a wither below half health

Small fireballs and dragon fireballs are not deflected upon hitting a wither below half health. This may not be a bug, since withers are immune to fire and dragon’s breath (in fact, they heal from the latter due to MC-299395), but if wither armor is intention to function like breeze armor and deflect projectiles rather than absorbing them then this behavior would be inconsistent.

To reproduce

1. Launch the game with output enabled

2. /summon wither ~ ~ ~ {Silent:1b,NoAI:1b,Health:10f}

3. /data get entity @s UUID

4. Copy your UUID from the game output

5. Position yourself a couple of blocks west of the wither, and face it

6. /summon minecraft:small_fireball ^ ^ ^1 {Motion:[1d,0d,0d],Owner:YOUR_UUID_HERE}
   The small fireball is destroyed when it hits the wither