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WhatsApp does not always include the context field on incoming template quick-reply button presses (observed in production on Cloud API webhooks that also carry the new user_id/from_user_id fields). CallbackButton.from_update and CallbackSelection.from_update index msg["context"] unconditionally, so such updates raise KeyError: 'context' and are dropped by the server's update constructor — the handler never fires and, since 200 is returned, Meta never redelivers. Parse context the same way Message.from_update already does: treat it as optional and set reply_to_message=None when absent. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
CallbackSelection only ever parses interactive list_reply payloads, which always carry the context field — only the button payload type (template QuickReplyButton clicks) omits it. Revert the defensive context parsing and synthetic fixture for CallbackSelection, and document on CallbackButton.reply_to_message (sync and async) that it is None specifically for template quick-reply clicks. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
[callback] treat missing message context as no reply_to_message in template quick-reply
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