1.21.4 Version using End Crystal implementation does not remove all of a player's "Explosion Knockback Resistance"

[pearuhdox]

Looking at the internals on function internal/launch/main - the system removes the player's "knockback resistance" but not the player's "explosion knockback resistance". These are now 2 separate attributes - the latter provided by the Blast Protection enchantment - meaning Player Motion moves a player less when they are affected by Blast Protection.