Wind charge knockback is reduced by blast protection

Wind charge knockback is reduced by blast protection despite not being an explosion

Steps to reproduce:
1. Throw a wind charge below yourself and record the knockback
2. Equip a piece of armor with blast protection 4
3. Throw a wind charge below yourself and record the knockback

Expected result:
The knockback is the same
Received result:
The knockback is drastically lower with blast protection 4