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StarterKit registers Tiptap's Underline extension by default. It maps both `<u>` and `text-decoration: underline` to an underline mark and serializes that mark as `++text++` — a syntax neither CommonMark nor GFM defines. The display layer (ReadonlyContent: react-markdown + remark-gfm) has no rule for it, so a saved comment rendered the delimiters literally. Disable the extension in the shared StarterKit config rather than filtering `u` out of the rich-HTML paste selector: the mark is also reachable via the extension's own Mod-u shortcut, so a paste-only fix would leave Cmd+U able to produce the same unrenderable Markdown. Removing the extension also removes its `++text++` markdown tokenizer, so existing text containing `++` now round-trips as literal text instead of being silently reinterpreted as an underline mark. This is shared editor config: it applies to every ContentEditor surface (issue comments, issue descriptions, chat, agent prompts), not just the comment box. No toolbar control, command, or stylesheet referenced the mark. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com> Co-authored-by: multica-agent <github@multica.ai>