I’ve been seeing this in the feed
https://newsblur.com/site/33523/twenty-sided from address
Most recent example seems to be in what is currently the second-newest item, with title “Grand Theft Auto Trilogy: Derision Edition” - the first paragraph has a relative link right away (which I notice only has a query string):
<content:encoded><![CDATA[<p>On the podcast <a href="?p=53206">yesterday</a>,
This link gets resolved to
https://newsblur.com/site/33523/twenty-sided?p=53206 when I view the post in Newsblur.
I don’t recall how long I’ve been seeing this but I think it’s been longer than a few days. I don’t think it always happened, but it’s also possible that the blog in question didn’t always use relative links.