Web UI not showing all messages from LLM

Seeing a consistent issue where the UI does not render a message from the LLM, even though I can see it in the logs.

Referencing the example below: the logs show that the agent calls the fetch_job_data tool and then immediately returns a message with the job summary. The user doesn't see it, and sends "are you still thinking?" two minutes later.

Using python 3.11 and google-adk v1.0, but issue occurred with earlier versions as well. Deployed to Google Cloud Run using adk deploy. Not seeing any errors or warnings.