Fix custom block registration

src/main/java/me/deftware/mixin/mixins/game/MixinForgeRegistry.java

+package me.deftware.mixin.mixins.game;
+
+import me.deftware.mixin.shared.RegistryManagement;
+import net.minecraftforge.registries.ForgeRegistry;
+import net.minecraftforge.registries.IForgeRegistryEntry;
+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(value = ForgeRegistry.class, remap = false)
+public class MixinForgeRegistry<V extends IForgeRegistryEntry<V>> {
+
+    @Inject(method = "register", at = @At("HEAD"), remap = false)
+    private void register(V value, CallbackInfo ci) {
+        RegistryManagement.register(value, value.getRegistryName());
+    }
+
+}

src/main/java/me/deftware/mixin/mixins/game/MixinRegistry.java

 package me.deftware.mixin.mixins.game;
 
-import me.deftware.client.framework.registry.BlockRegistry;
-import me.deftware.client.framework.registry.ItemRegistry;
-import net.minecraft.block.Block;
-import net.minecraft.item.Item;
+import me.deftware.mixin.shared.RegistryManagement;
 import net.minecraft.util.ResourceLocation;
 import net.minecraft.util.registry.Registry;
 import org.spongepowered.asm.mixin.Mixin;
@@ -16,11 +13,7 @@ public class MixinRegistry {
 
 	@Inject(method = "register(Lnet/minecraft/util/registry/Registry;Lnet/minecraft/util/ResourceLocation;Ljava/lang/Object;)Ljava/lang/Object;", at = @At("HEAD"))
 	private static <V, T extends V> void register(Registry<V> registry, ResourceLocation id, T entry, CallbackInfoReturnable<T> cir) {
-		if (entry instanceof Block) {
-			BlockRegistry.INSTANCE.register(id.toString(), (Block) entry);
-		} else if (entry instanceof Item) {
-			ItemRegistry.INSTANCE.register(id.toString(), (Item) entry);
-		}
+		RegistryManagement.register(entry, id);
 	}
 
 }

src/main/java/me/deftware/mixin/shared/RegistryManagement.java

+package me.deftware.mixin.shared;
+
+import me.deftware.client.framework.registry.BlockRegistry;
+import me.deftware.client.framework.registry.ItemRegistry;
+import net.minecraft.block.Block;
+import net.minecraft.item.Item;
+import net.minecraft.util.ResourceLocation;
+
+public class RegistryManagement {
+
+    public static <T> void register(T entry, ResourceLocation id) {
+        if (entry instanceof Block) {
+            BlockRegistry.INSTANCE.register(id.toString(), (Block) entry);
+        } else if (entry instanceof Item) {
+            ItemRegistry.INSTANCE.register(id.toString(), (Item) entry);
+        }
+    }
+
+}

src/main/resources/mixins.emc.json

@@ -28,6 +28,7 @@
     "game.MixinMinecraft",
     "game.MixinSoundSystem",
     "game.MixinTimer",
+    "game.MixinForgeRegistry",
     "gui.MixinChatSuggestion",
     "gui.MixinCreativeInventoryScreen",
     "gui.MixinDebugHud",