[python][bug] `types.py` does not contain `MapsResourceTagsUpdate` but it was inferred in operation file

[msyyc]

For https://github.com/Azure/azure-rest-api-specs/tree/9ee5902c9557817bc4a859ebc13f757515aac5d7/specification/azuredependencymap/DependencyMap.Management, the generated sdk code is:

    def _update_initial(
        self,
        resource_group_name: str,
        map_name: str,
        properties: Union[_models.MapsResourceTagsUpdate, _types.MapsResourceTagsUpdate, IO[bytes]],
        **kwargs: Any
    ) -> Iterator[bytes]:
        error_map: MutableMapping = {
            401: ClientAuthenticationError,
            404: ResourceNotFoundError,
            409: ResourceExistsError,
            304: ResourceNotModifiedError,
        }

But the MapsResourceTagsUpdate is not generated in types.py.

Reproduce

Use latest python emitter to generate sdk code with command tsp-client init -c https://github.com/Azure/azure-rest-api-specs/blob/9ee5902c9557817bc4a859ebc13f757515aac5d7/specification/azuredependencymap/DependencyMap.Management/tspconfig.yaml in azure-sdk-for-python repo.

[github-actions]

🎯 Issue Triage

The Python emitter generates an operation signature that references _types.MapsResourceTagsUpdate, but the corresponding type is never emitted into _types.py, causing a broken/incomplete SDK.

Category: Bug
Area: emitter:client:python

⚠️ No reproduction TypeSpec code provided. The issue references the Azure REST API spec at specification/azuredependencymap/DependencyMap.Management and can be reproduced via tsp-client init.

🔍 Analysis

• The Python emitter incorrectly infers a type (MapsResourceTagsUpdate) for use in an operation's parameter union (Union[_models.MapsResourceTagsUpdate, _types.MapsResourceTagsUpdate, IO[bytes]]) but fails to emit the corresponding TypedDict entry in _types.py.
• This is likely a bug in the emitter's logic for deciding which types need to be included in _types.py — possibly the type is found via _models but the _types variant is also referenced without being generated.
• Affected spec: DependencyMap.Management

📝 Suggested next steps

• Reproduce with the provided tsp-client init command against the referenced spec commit
• Identify where the emitter decides to add a type to _types.py vs only _models.py
• Ensure that any type referenced as _types.X in an operation signature is always emitted in _types.py

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