fix(qwix): Dynamically reconstruct unknown variables in ToLinen wrapper

Author: hsuan-lun-chiang

src/maxtext/layers/nnx_wrappers.py

@@ -496,10 +496,19 @@ def maybe_unbox(x):
 
     if unknown_state_flat:
       paths_str = ""
-      for path, _ in unknown_state_flat.items():
+      for path, value_state in unknown_state_flat.items():
         paths_str += f"\n  - {'/'.join(map(str, path))}"
-
-      warnings.warn(f"Found unknown module paths in incoming state:{paths_str}")
+        
+        # Dynamically reconstruct the unknown variables
+        curr = module
+        for p in path[:-1]:
+          if not hasattr(curr, p):
+            setattr(curr, p, nnx.Module())
+          curr = getattr(curr, p)
+        if not hasattr(curr, path[-1]):
+          setattr(curr, path[-1], value_state.type(value_state.value))
+
+      warnings.warn(f"Found unknown module paths in incoming state:{paths_str}. They have been dynamically reconstructed.")
 
     nnx.update(module, new_state)
     _refresh_variable_trace_state(module)