I generally go on this site with my phone. Currently a Google Pixel
Recently, (around the same time that changes were made for the home page) I noticed a change in the forum performance. Previously, I would open the topic, read it, and then, when I finished, I would have to select the green button to tell it that I had read it. Annoying, but ok. A month or so ago, I noticed that it seemed to know that I had read it. Green button turns grey. Great. No complaints, and there was lots of other issues going on, so I didn't add anything to the bandwidth, even if it would have been complimentary.
Today, it is all back to the old way. If I have read it, I have to select the button or it stays lit.
Minor annoyance, but SOMETHING is going on.