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appendHtmlPreviewBaseHref detected the head tag with /<head[^>]*>/i, which also matches <header ...>. For a fragment with no <head> that opens with <header> - a common shape in agent-generated report pages - the <base> element was injected after the <header> opening tag instead of being prepended, so relative assets appearing before that point (e.g. a leading <img>) resolved without the base and failed to load in the sandboxed iframe. Use the word-boundary-safe /<head(?:\s[^>]*)?>/i that the sibling appendHtmlPreviewScrollRestoration already uses, keeping the two injectors consistent.