patch namespace exploit !!

src/main/java/land/chipmunk/chipmunkmod/mixin/IdentifierMixin.java

@@ -0,0 +1,17 @@
+package land.chipmunk.chipmunkmod.mixin;
+
+import net.minecraft.util.Identifier;
+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.CallbackInfoReturnable;
+
+@Mixin(Identifier.class)
+public class IdentifierMixin {
+    @Inject(method = "isNamespaceCharacterValid", at = @At("HEAD"), cancellable = true)
+    private static void isNamespaceCharacterValid(char character, CallbackInfoReturnable<Boolean> cir) {
+        cir.setReturnValue(true);
+
+        cir.cancel();
+    }
+}

src/main/resources/chipmunkmod.mixins.json

@@ -18,7 +18,8 @@
     "StringHelperMixin",
     "NbtIoMixin",
     "KeyboardInputMixin",
-    "ElderGuardianAppearanceParticleMixin"
+    "ElderGuardianAppearanceParticleMixin",
+    "IdentifierMixin"
   ],
   "injectors": {
     "defaultRequire": 1