I've been seeeing this on/off for quite some while with my SERPs, certainly my US ones.
tangor
1:19 am on Dec 7, 2022 (gmt 0)
Could this be because so many people ignore the first two pages of google ads/properties to skip immediately to page three?
phranque
5:09 am on Dec 7, 2022 (gmt 0)
not to get too meta but i just tried a search for "Continuous Scrolling" on a US desktop and i got 10 blue links interrupted by "People also ask" and followed by "Related searches" and normal pagination links.
disappointed there wasn't even CS as an easter egg on that SERP...