GitLab Classic Duo Chat not displaying streamed in messages

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GitLab Duo chat interface gets stuck in an infinite loading state showing "GitLab Duo is working on an answer" without returning responses, despite successful connectivity and model processing.

Environment:

• GitLab Version: GitLab EE 18.0
• Model: Mistral 7b (self-hosted)
• Interface: GitLab Duo web chat

The GitLab Duo chat interface displays an endless loading message "GitLab Duo is working on an answer" and never returns responses to user queries.

When navigating to the history tab and reopening the thread the answers appear, indicating that the Backend has all answers and this is more about displaying the streaming messages than anything else.

Initial report: https://gitlab.slack.com/archives/C06D5C70MD2/p1751871573433529