`replace_defs_in_schema` does not handle `$ref` inside `anyOf` array (`method="json_mode"`)

[jinohkang-theori]

In replace_defs_in_schema:

langchain-google/libs/genai/langchain_google_genai/_function_utils.py

Lines 557 to 565 in f69d32f

	for key, value in original_schema.items():
	if key == "$defs":
	continue
	if not isinstance(value, dict):
	resulting_schema[key] = value
	else:
	if "$ref" in value:
	new_value = value.copy()

Note that only dicts are handled, not lists. This skips nested schema inside arrays, such as {"anyOf": [{"$refs": "..."}]}.

This happens with Pydantic named RootModel[Type1 | Type2 | ...] union schemas.

[yotamgabi]

This is indeed an annoying issue..