Fix missing registry entry for Lycanites custom item entity

src/main/java/fermiummixins/config/LycanitesMobsConfig.java

@@ -45,6 +45,17 @@ public class LycanitesMobsConfig {
 			reason = "Requires mod to properly function"
 	)
 	public boolean asmodeusMinionPatch = false;
+
+	@Config.Comment("Fixes the missing registry entry that causes lycanites item drops to always be removed when unloaded")
+	@Config.Name("Custom Item Entity Registry Patch (LycanitesMobs)")
+	@Config.RequiresMcRestart
+	@MixinConfig.MixinToggle(lateMixin = "mixins.fermiummixins.late.lycanitesmobs.customitem.json", defaultValue = false)
+	@MixinConfig.CompatHandling(
+			modid = ModLoadedUtil.LycanitesMobs_MODID,
+			desired = true,
+			reason = "Requires mod to properly function"
+	)
+	public boolean customItemEntityRegistryPatch = false;
 
 	@Config.Comment("Allows for placing mob charges in item frames")
 	@Config.Name("Allow Charges In Item Frames (LycanitesMobs)")

src/main/java/fermiummixins/mixin/lycanitesmobs/ObjectManager_CustomItemMixin.java

@@ -0,0 +1,33 @@
+package fermiummixins.mixin.lycanitesmobs;
+
+import com.lycanitesmobs.LycanitesMobs;
+import com.lycanitesmobs.ObjectManager;
+import com.lycanitesmobs.core.entity.EntityItemCustom;
+import net.minecraftforge.event.RegistryEvent;
+import net.minecraftforge.fml.common.registry.EntityEntry;
+import net.minecraftforge.fml.common.registry.EntityEntryBuilder;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(ObjectManager.class)
+public abstract class ObjectManager_CustomItemMixin {
+
+    @Inject(
+            method = "registerSpecialEntities",
+            at = @At("TAIL"),
+            remap = false
+    )
+    private static void fermiummixins_lycanitesMobsObjectManager_registerSpecialEntities(RegistryEvent.Register<EntityEntry> event, CallbackInfo ci){
+        String entityName = "custom_item";
+        String registryName = LycanitesMobs.modInfo.modid + ":" + entityName;
+        EntityEntry entityEntry = EntityEntryBuilder.create()
+                .entity(EntityItemCustom.class)
+                .id(registryName, ObjectManager.getNextSpecialEntityNetworkId())
+                .name(entityName)
+                .tracker(64, 20, true)
+                .build();
+        event.getRegistry().register(entityEntry);
+    }
+}

src/main/resources/mixins.fermiummixins.late.lycanitesmobs.customitem.json

@@ -0,0 +1,11 @@
+{
+  "required": true,
+  "package": "fermiummixins.mixin",
+  "refmap": "mixins.fermiummixins.refmap.json",
+  "compatibilityLevel": "JAVA_8",
+  "target": "@env(DEFAULT)",
+  "minVersion": "0.8",
+  "mixins": [
+    "lycanitesmobs.ObjectManager_CustomItemMixin"
+  ]
+}