Science magazine [0] and Ars Technica [1] published readable overviews. The paper on the experiment regarding Wigner's friend paradox ("A strong no-go theorem on the Wigner’s friend paradox") was published in Nature Physics. [2] [3]

[0] https://www.sciencemag.org/news/2020/08/quantum-paradox-poin...

[1] https://arstechnica.com/science/2020/08/quantum-reality-is-e...

[2] https://doi.org/10.1038/s41567-020-0990-x

[3] https://www.nature.com/articles/s41567-020-0990-x