Unity RSS feeds change their items' GUID after being published, leading to dupes in some RSS readers

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I subscribe to this feed, so I know when new Unity patch notes are out:

https://unity.com/releases/editor/lts-releases.xml

I noticed that in my feed reader, Unity’s articles were always getting duplicated. I’d see two entries for each release. I asked the developers of the RSS viewer I use, and the issue appears to be because Unity’s changing the GUID for their feed items after initially publishing them.

For example, the latest release for 2021.3.26 LTS initially had this GUID a day ago: <guid isPermaLink="false">a16dc32e0ff2</guid>. If you check it now, however, the GUID for that item has changed to <guid isPermaLink="false">29884 at https://unity.com</guid>

Is there a good reason for the guids to change like this? I can’t find any specification that says you’re definitely not supposed to be doing that after publishing. But it does seem like a sloppy way to manage your feed: feed - What are ramifications of changing RSS item GUID or Atom entry id? - Stack Overflow

Anyway, clearly not the biggest issue. Just something someone might want to look at.

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What’s even more odd is that it looks like the guids for all of the articles in the feed change each time. I’m attaching two different raw outputs of the feed, one taken yesterday, and one taken today. You’ll see that for all of the s in the feed, they’ll have one guid a day ago, and a new guid today.

It feels like there are two competing editors of the feed, and each has a different way of setting the guid. When a new article is posted, the guids all look like random alphanumeric values. A day later, something else edits the feed, and all of the guids change to the “XYZ at https://unity.com”

9040771–1248556–LTS RSS Raw V1.txt (392 KB)
9040771–1248559–LTS RSS Raw V2.txt (393 KB)