Hola @ScaryLarryGames1 , gracias por reportar esto.
La solución fue, al final, la que sugeriste con el textarea y acaba de ser fusionada. Dale unos días para que pase por CI/CD y llegue a la rama latest.
main ← fix-form-template-composer-preview-newlines
merged 08:41PM - 31 Aug 26 UTC
Follow up to #42192, which switched the composer field's hidden validation stand… -in from `type="hidden"` to `type="text"` so `required` would fire on submit. Text inputs strip CR/LF on value assignment per the HTML value-sanitization rules, and the reply body is assembled from these controls via `new FormData(form)`, so multi-line composer input came out flattened in the edit preview. Saved posts were unaffected because the raw source is read from the editor directly.
Swap the stand-in to a visually hidden `<textarea>`. Textareas participate in constraint validation just like text inputs, preserving the required-field enforcement from #42192, but do not sanitize newlines, so multi-line content survives in the preview.
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