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As someone already mentioned, this has to do with the mysql.user table being changed to a view in 10.4. The problem and solution is documented on the MariaDB website in MDEV-22127.
The solution is to simply add the following two lines to the top of your all-dbs.sql dump file:
DROP TABLE IF EXISTS `mysql`.`global_priv`;
DROP VIEW IF EXISTS `mysql`.`user`;
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