fix MC-44654 (thanks Microcontrollers #474)

Author: isXander

.bugs

@@ -106,6 +106,7 @@ patched 272431 server basic
 patched 298066 server basic
 patched 263999 server basic
 patched 153010 server basic
+patched 44654 server basic
 
 previous 2025 17w47a
 previous 53312 22w17a

src/main/java/dev/isxander/debugify/mixins/basic/mc44654/EntityMixin.java

@@ -0,0 +1,35 @@
+package dev.isxander.debugify.mixins.basic.mc44654;
+
+import dev.isxander.debugify.fixes.BugFix;
+import dev.isxander.debugify.fixes.FixCategory;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.EntityType;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@BugFix(id = "MC-44654", category = FixCategory.BASIC, env = BugFix.Env.SERVER, description = "Some entities don't update position to the client when teleported")
+@Mixin(Entity.class)
+public abstract class EntityMixin {
+    @Shadow
+    public abstract EntityType<?> getType();
+
+    @Shadow
+    public boolean hasImpulse;
+
+    /**
+     * Since the update interval is set to infinity, the position will never get updated.
+     * To fix, we mark velocity as dirty via hasImpulse to force an update.
+     *
+     * We inject precisely here as the target is only called when `!firstTick && isServerLevel`,
+     * since this is where the issue occurs.
+     */
+    @Inject(method = "setPosRaw", at = @At(value = "INVOKE", target = "Lnet/minecraft/world/entity/Entity;isRemoved()Z"))
+    private void forceClientUpdate(CallbackInfo ci) {
+        if (this.getType().updateInterval() == Integer.MAX_VALUE) {
+            this.hasImpulse = true;
+        }
+    }
+}

src/main/resources/debugify.mixins.json

@@ -60,6 +60,7 @@
     "basic.mc297837.WaypointTransmitterMixin",
     "basic.mc298066.LivingEntityMixin",
     "basic.mc30391.LivingEntityMixin",
+    "basic.mc44654.EntityMixin",
     "basic.mc7569.RconConsoleSourceMixin",
     "basic.mc82263.EnderDragonMixin",
     "basic.mc84661.MobEffectsMixin",