[2021] Не могу зайти на свой сервер после обновления

Your server hasn't updated to the new version yet. To play with them you can downgrade your Steam version to 9.1.9 as well. You can do that by rightclicking eco in the library, going to properties, betas and choosing 9.1.9 in the drop down list. This only works while the game is not running.