Developer finds accessibility bug where streaming UI disrupts screen reader announcements

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A developer discovered a critical accessibility bug while testing a chat interface. The visual layer displayed streaming text tokens smoothly, but the accessibility layer treated each chunk as a new assertive announcement, causing previous speech to be aborted. This mismatch created focus order issues, including a copy button appearing prematurely and stealing tab focus from the text composer. The bug was identified through logging focus events and live-region mutations rather than visual inspection alone.

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