Fri, Oct. 16, 2020 - fixed
Apparently Google does A/B testing with some of its users, it shows results with a different CSS style, which removes underlining from search result titles.
This just happened to me and I hate it. The underlines helped quickly differentiate search results into separate logical segments. Now it looks like a huge blob of floating text with absent visual feedback.
So, I wrote this userscript to add the underlines back.