Research Assistant cannot summarize GitHub issues URLs correctly (but it can as a PDF)

Set Assistant to Research > Expert.
Click Upload
Copy+paste URL https://github.com/hagezi/dns-blocklists/issues/2346.
Assistant only summarizes the initial post of the GitHub issue (255 words). It does not include details of subsequent posts in the URL. See thread=DkeYjGMWy5E8I7Ebt5ijPrTaLC7uwP83.

url.txt

3kB

However, if I upload the page as a PDF, it captures all posts made within that GitHub issue.

Go to https://github.com/hagezi/dns-blocklists/issues/2346
Press Ctrl + P and save the page as a PDF.
Go to kagi.com. Set Assistant to Research > Expert.
Upload the PDF file.
Assistant summarizes correctly, taking in the whole context (2173 words). thread=edJWdtV2TDlj8nUo2PJV0F63lmNeJzqa

pdf.txt

1kB

Assistant should take into account all posts within the GitHub issue ticket from the URL.