Fixed a Accessor missing a prefix.

src/main/java/com/gregtechceu/gtceu/api/data/chemical/material/IMaterialRegistry.java

@@ -83,7 +83,7 @@ default Material getMaterial(String name) {
     /**
      *
      * @return {@code true} if this registry is frozen, {@code false} otherwise
-     * @see MappedRegistryAccessor#isFrozen()
+     * @see MappedRegistryAccessor#gtceu$isFrozen()
      */
     boolean isFrozen();
 }

src/main/java/com/gregtechceu/gtceu/api/data/chemical/material/registry/MaterialRegistry.java

@@ -111,7 +111,7 @@ public Material getDefaultFallback() {
 
     @Override
     public boolean isFrozen() {
-        return ((MappedRegistryAccessor) (Object) this).isFrozen();
+        return ((MappedRegistryAccessor) (Object) this).gtceu$isFrozen();
     }
 
     public void close() {

src/main/java/com/gregtechceu/gtceu/core/mixins/MappedRegistryAccessor.java

@@ -8,6 +8,6 @@
 @Mixin(MappedRegistry.class)
 public interface MappedRegistryAccessor {
 
-    @Accessor
-    boolean isFrozen();
+    @Accessor("frozen")
+    boolean gtceu$isFrozen();
 }