Don't let custom nodes overwrite base nodes.

nodes.py

@@ -1498,7 +1498,7 @@ NODE_DISPLAY_NAME_MAPPINGS = {
     "VAEEncodeTiled": "VAE Encode (Tiled)",
 }
 
-def load_custom_node(module_path):
+def load_custom_node(module_path, ignore=set()):
     module_name = os.path.basename(module_path)
     if os.path.isfile(module_path):
         sp = os.path.splitext(module_path)
@@ -1512,7 +1512,9 @@ def load_custom_node(module_path):
         sys.modules[module_name] = module
         module_spec.loader.exec_module(module)
         if hasattr(module, "NODE_CLASS_MAPPINGS") and getattr(module, "NODE_CLASS_MAPPINGS") is not None:
-            NODE_CLASS_MAPPINGS.update(module.NODE_CLASS_MAPPINGS)
+            for name in module.NODE_CLASS_MAPPINGS:
+                if name not in ignore:
+                    NODE_CLASS_MAPPINGS[name] = module.NODE_CLASS_MAPPINGS[name]
             if hasattr(module, "NODE_DISPLAY_NAME_MAPPINGS") and getattr(module, "NODE_DISPLAY_NAME_MAPPINGS") is not None:
                 NODE_DISPLAY_NAME_MAPPINGS.update(module.NODE_DISPLAY_NAME_MAPPINGS)
             return True
@@ -1525,6 +1527,7 @@ def load_custom_node(module_path):
         return False
 
 def load_custom_nodes():
+    base_node_names = set(NODE_CLASS_MAPPINGS.keys())
     node_paths = folder_paths.get_folder_paths("custom_nodes")
     node_import_times = []
     for custom_node_path in node_paths:
@@ -1537,7 +1540,7 @@ def load_custom_nodes():
             if os.path.isfile(module_path) and os.path.splitext(module_path)[1] != ".py": continue
             if module_path.endswith(".disabled"): continue
             time_before = time.perf_counter()
-            success = load_custom_node(module_path)
+            success = load_custom_node(module_path, base_node_names)
             node_import_times.append((time.perf_counter() - time_before, module_path, success))
 
     if len(node_import_times) > 0: