fix blast prot kb (MC-198809)

src/main/java/com/nexia/core/mixin/misc/ProtectionEnchantmentMixin.java

@@ -0,0 +1,27 @@
+package com.nexia.core.mixin.misc;
+
+import net.minecraft.util.Mth;
+import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.item.enchantment.EnchantmentHelper;
+import net.minecraft.world.item.enchantment.Enchantments;
+import net.minecraft.world.item.enchantment.ProtectionEnchantment;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+
+@Mixin(ProtectionEnchantment.class)
+public class ProtectionEnchantmentMixin {
+    /**
+     * @author NotInfinityy
+     * @reason This fixes blast protection not reducing explosion knockback
+     * <a href="https://bugs.mojang.com/browse/MC-198809">MC-198809</a>
+     */
+    @Overwrite
+    public static double getExplosionKnockbackAfterDampener(LivingEntity livingEntity, double d) {
+        int i = EnchantmentHelper.getEnchantmentLevel(Enchantments.BLAST_PROTECTION, livingEntity);
+        if (i > 0) {
+            d *= Mth.clamp(1.0 - (double)i * 0.15, 0.0, 1.0);
+        }
+
+        return d;
+    }
+}

src/main/resources/core.mixins.json

@@ -45,6 +45,7 @@
     "misc.ExplosionMixin",
     "misc.ItemCombinerMenuMixin",
     "misc.MinecraftServerMixin",
+    "misc.ProtectionEnchantmentMixin",
     "misc.ServerLevelMixin",
     "misc.commands.BanCommandMixin",
     "misc.commands.EmoteCommandMixin",