This is another Google update for sure. Whether it's a result of the previous core algorithm changes or a new update to the system is not yet revealed. Some of my low authority sites got wiped out. They were pushed back to prioritize high authority sites. Google now started showing 3-4 related pages from each high authority site before showing one relevant result each from low authority sites in SERPs. This will probably give 10x boost to high authority sites, encouraging them to keep doing SEO for Google and spending money on ads.
Google is also trying to improve the CTR for their own parasites like Youtube & Reddit, distributing them through out the SERPs instead of grouping them together on first page in a carousel or a feature snippet. Earlier, I used to find all Youtube videos in a top videos snippet in SERPs and all Reddit threads in a forums or a dedicated Reddit snippet. But now, Google is distributing these results through out pages to the extent that I'm finding at least 1 Youtube video & 1 Reddit thread on each page of SERPs for some results.
There could be multiple reasons for this behavior but I don't want to speculate at this stage. Let's wait until we get a bigger picture to understand the impact of this update.