Drush migrate:import (version 10.3.6) seems to be updating existing content regardless if the --update option is used or not. What could be the problem? I've tested it both with and without the --update option and it behaves the same way. However, when I ran it using the migration tools module, it is opposite - nothing gets updated in both cases.. It seems this problem has started after the site in question was upgraded to d9 from d8. Currently I have no idea where to look and would appreciate some pointers.