A2 Microbes in the News
https://www.the-scientist.com/news-opinion/signs-of-ancient-microbial-life-questioned-64955
It is quite a bit older than other papers, but this article talks about a 2016 review of the stromatolites found in Iceland. These researchers, Allwood, Rosing, Flannery, Hurowitz, and Heirwegh, believe that the stromatolites could be not biological at all, but rather a natural geological process.
This is interesting because it could rewrite what we know about the early phases of life on earth.