Blog post link is incorrectly rendered as file:// protocol

[doekman]

I subscribed to this feed (pretty popular at the moment):

https://blog.jacopo.io/en/post/index.xml

When I want to open the article by clicking on the title, nothing happens.
When I select context-click + Open In Browser, I get a message with finder icon "The App can't be opened. -50".

Inspecting the XML feed with curl reveals the feed is using relative URLs:

<item>
  <title>Reverse engineering Trenitalia&#39;s mobile application</title>
  <link>/en/post/trenitalia-reverse-engineering/</link>
  <pubDate>Mon, 24 Sep 2018 00:00:00 +0000</pubDate>
  
  <guid>/en/post/trenitalia-reverse-engineering/</guid>
  <description>&lt;p&gt;Trenitalia ha da poco rilasciato la nuova versione della sua app per iOS e Android. Avendo già avuto a che fare con i meravigliosi sistemi informatici delle Ferrovie dello Stato per lo sviluppo di &lt;a href=&#34;https://trenitbot.jacopo.io&#34;target=&#34;_blank&#34;&gt;&lt;strong&gt;TrenItBot&lt;/strong&gt;&lt;/a&gt; e per altri progetti, una sbirciata anche qui non poteva mancare.&lt;/p&gt;</description>
  
</item>

I think the links should resolve to the following (combining feed URL + article URL).

https://blog.jacopo.io/en/post/trenitalia-reverse-engineering/

I'm using NetNewsWire Version 5.1.3 (3018) on macOS 10.15.7 (19H15).
Feed is added to "On My Mac" account.

[doekman]

Oops, sorry, it appears the original RSS was the cause of this after all. I'll inform the webmaster.