Just implement ArmedArmorStandsModule with a mixin. Fixes #4470

src/main/java/org/violetmoon/quark/content/tweaks/module/ArmedArmorStandsModule.java

@@ -1,42 +1,31 @@
 package org.violetmoon.quark.content.tweaks.module;
 
-import org.violetmoon.zeta.event.bus.PlayEvent;
-import org.violetmoon.zeta.event.play.entity.ZEntityConstruct;
+import org.violetmoon.zeta.event.bus.LoadEvent;
+import org.violetmoon.zeta.event.load.ZConfigChanged;
 import org.violetmoon.zeta.module.ZetaLoadModule;
 import org.violetmoon.zeta.module.ZetaModule;
 import org.violetmoon.zeta.util.Hint;
 
-import net.minecraft.world.entity.decoration.ArmorStand;
 import net.minecraft.world.item.Item;
 import net.minecraft.world.item.Items;
 
 /**
  * @author WireSegal
  * Created at 8:40 AM on 8/27/19.
+ *
+ * modified by quat
+ * @see org.violetmoon.quark.mixin.ArmorStandMixin
  */
 @ZetaLoadModule(category = "tweaks")
 public class ArmedArmorStandsModule extends ZetaModule {
 
 	@Hint Item armor_stand = Items.ARMOR_STAND;
 
-	@PlayEvent
-	public void entityConstruct(ZEntityConstruct event) {
-		if(event.getEntity() instanceof ArmorStand stand) {
-			if(!stand.isShowArms())
-				setShowArms(stand, true);
-		}
-	}
+	public static boolean staticEnabled = true;
 
-	private void setShowArms(ArmorStand e, boolean showArms) {
-		e.getEntityData().set(ArmorStand.DATA_CLIENT_FLAGS, setBit(e.getEntityData().get(ArmorStand.DATA_CLIENT_FLAGS), 4, showArms));
+	@LoadEvent
+	public void configChange(ZConfigChanged e) {
+		staticEnabled = enabled;
 	}
 
-	private byte setBit(byte status, int bitFlag, boolean value) {
-		if (value)
-			status = (byte)(status | bitFlag);
-		else
-			status = (byte)(status & ~bitFlag);
-
-		return status;
-	}
 }

src/main/java/org/violetmoon/quark/mixin/ArmorStandMixin.java

@@ -0,0 +1,26 @@
+package org.violetmoon.quark.mixin;
+
+import net.minecraft.network.syncher.SynchedEntityData;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.decoration.ArmorStand;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.Constant;
+import org.spongepowered.asm.mixin.injection.ModifyConstant;
+import org.violetmoon.quark.content.tweaks.module.ArmedArmorStandsModule;
+
+@Mixin(ArmorStand.class)
+public class ArmorStandMixin {
+	@ModifyConstant(method = "defineSynchedData", constant = @Constant(intValue = 0))
+	private int asdasld(int orig) {
+		if(!ArmedArmorStandsModule.staticEnabled)
+			return orig;
+
+		//try to be careful - this is a kinda scary looking mixin, lol
+		SynchedEntityData data = ((Entity) (Object) this).getEntityData();
+		if(data.hasItem(ArmorStand.DATA_CLIENT_FLAGS))
+			return orig; //it's already been defined
+
+		else
+			return orig | ArmorStand.CLIENT_FLAG_SHOW_ARMS; // | 4
+	}
+}

src/main/resources/quark.mixins.json

@@ -8,6 +8,7 @@
     "AbstractVillagerMixin",
     "AnimalMixin",
     "AnvilMenuMixin",
+    "ArmorStandMixin",
     "ArrowPiercingEnchantmentMixin",
     "BannerDuplicateRecipeMixin",
     "BaseCoralPlantTypeBlockMixin",