We have an integration between Stack Overflow and Slack: an RSS feed of questions with specific tags. The exact RSS feed we use, is:
This allows us to monitor Stack Overflow for questions relevant to our product, in a way recommended in the Help Center:
Finally, monitor the site. Stack Overflow gets thousands of questions every day and they are often answered within minutes. Be responsive: monitor the tags related to your product, search for questions that might not be tagged correctly and improve them, and review and improve answers.
We noticed that the site icon in the RSS feed changed recently, it's a much bigger version now.
This is what it looked like until June 28 at 16:56:33.
This is what it looks like since June 28 at 21:11:30.
The large site icon is undesired and unexpected behavior, which I would classify as a design "bug". Because of the large icon, now less questions fit on one screen, which makes it slightly more difficult to have a good oversight of which questions are interesting to answer.
Sometimes a question contains an image, then the site icon is replaced by that image:
This is expected and desired behavior, and should not change.
TL;DR: please restore the small site icon in the RSS feed.