Examining the Raw edit, links do not display when the :notes attribute is an empty-string.
{:title "Neal Stephenson",
:profile
"American writer and game designer. He has written the <a href=\"https://www.bookogs.com/credit/476683-baroque-cycle\">Baroque Cycle</a> series.\n\nReal name: Neal Town Stephenson",
:external_links
[{:url "http://www.nealstephenson.com", :notes ""}
{:url "https://twitter.com/nealstephenson", :notes ""}
{:url "https://www.facebook.com/TheNealStephenson", :notes ""}
{:url "https://en.wikipedia.org/wiki/Neal_Stephenson", :notes ""}]}
Workaround: Editing the credit fixes the issue by re-serializing external_links without the :notes attribute.
{:title "Neal Stephenson",
:profile
"American writer and game designer. He has written the <a href=\"https://www.bookogs.com/credit/476683-baroque-cycle\">Baroque Cycle</a> series.\n\nReal name: Neal Town Stephenson",
:external_links
[{:url "http://www.nealstephenson.com"}
{:url "https://twitter.com/nealstephenson"}
{:url "https://www.facebook.com/TheNealStephenson"}
{:url "https://en.wikipedia.org/wiki/Neal_Stephenson"}]}