describe table query not routed to shard that contains the schema

The following message is shown

SELECT command denied to user 'user'@'host' for table 'mysql_table'

when running one of the following queries

SHOW COLUMNS IN database.tablename IN database;

EXPLAIN database.tablename;

DESCRIBE database.tablename;

This happens when no default database is set or when connected to a default database that is not on the same shard as the database that contains the table.