This isn’t surprising. The EPA ignored the science about the volatility (ability to vaporize and lift off plants and be spread by the wind after application) of Dicamba. Of course, Monsanto did not allow any independent volatility studies when it initially developed Dicamba resistant soybeans.
Link: https://www.dtnpf.com/agriculture/web/ag/crops/article/2020/06/04/know-legal-status-dicamba
Link:
https://www.arkansasonline.com/news/2018/nov/21/epa-scientists-dicamba-input-went-unhee/