diff --git a/arclight-common/src/main/java/io/izzel/arclight/common/mixin/core/world/gen/feature/template/TemplateManagerMixin.java b/arclight-common/src/main/java/io/izzel/arclight/common/mixin/core/world/gen/feature/template/TemplateManagerMixin.java
new file mode 100644
index 00000000..e9fb6d90
--- /dev/null
+++ b/arclight-common/src/main/java/io/izzel/arclight/common/mixin/core/world/gen/feature/template/TemplateManagerMixin.java
@@ -0,0 +1,29 @@
+package io.izzel.arclight.common.mixin.core.world.gen.feature.template;
+
+import com.mojang.datafixers.DataFixer;
+import net.minecraft.resources.IResourceManager;
+import net.minecraft.util.ResourceLocation;
+import net.minecraft.world.gen.feature.template.Template;
+import net.minecraft.world.gen.feature.template.TemplateManager;
+import net.minecraft.world.storage.SaveFormat;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Mutable;
+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;
+
+import java.util.Collections;
+import java.util.Map;
+
+@Mixin(TemplateManager.class)
+public class TemplateManagerMixin {
+
+    @Shadow @Final @Mutable private Map<ResourceLocation, Template> templates;
+
+    @Inject(method = "<init>", at = @At("RETURN"))
+    private void arclight$init(IResourceManager p_i232119_1_, SaveFormat.LevelSave p_i232119_2_, DataFixer p_i232119_3_, CallbackInfo ci) {
+        this.templates = Collections.synchronizedMap(this.templates);
+    }
+}
diff --git a/arclight-common/src/main/resources/mixins.arclight.core.json b/arclight-common/src/main/resources/mixins.arclight.core.json
index 8f8223ee..6bb879b9 100644
--- a/arclight-common/src/main/resources/mixins.arclight.core.json
+++ b/arclight-common/src/main/resources/mixins.arclight.core.json
@@ -411,6 +411,7 @@
     "world.chunk.storage.RegionFileCacheMixin",
     "world.gen.WorldGenRegionMixin",
     "world.gen.feature.structure.SwampHutPieceMixin",
+    "world.gen.feature.template.TemplateManagerMixin",
     "world.raid.RaidManagerMixin",
     "world.raid.RaidMixin",
     "world.server.ChunkHolderMixin",