Similar for many other things, the report most countries based the safety of roundup on was written by Monsanto itself. Most countries only check these reports for completeness and obvious errors, they don't try to run the studies themselves. However that "error checking" of the report is something where the FAA fucked up, the information on the MCAS provided by Boeing was completely out of date, either the documented testing procedures where incomplete or the FAA did not notice that the MCAS handled cases far outside of its original specification.