Looks like Google is testing another design and layout for displaying forums in the search results. Now Google is labeling this "discussions" and showing it in this two column and multiple rows carousel interface.
Here is a screenshot and followed by a video from Saad AK on Twitter:
Here is the video he captured of it in action:
On Mobile: Seeing "Discussions" section in Google SERPs (I believe it's new) it has forums listed in it.
— Saad AK (@SaadAlikhan1994) August 3, 2021
I have recorded it.
Sending to: @rustybrick SIR. pic.twitter.com/ksQEeCzF2j
Valentin Pletzer did first spot this back in March but I don't think I covered it then...
a onebox for "Discussions" #google #mobile #serp pic.twitter.com/7wxwZbqXjD
— Valentin Pletzer (@VorticonCmdr) March 29, 2021
Forum discussion at Twitter.
Another layout:
Google testing "Discussions" onebox clustering forum and q&a site posts #google #mobile #serp cc @rustybrick pic.twitter.com/Zw8yO5lM9P
— Valentin Pletzer (@VorticonCmdr) February 3, 2022