SHOW TABLE STATUS FROM some_schema Fails with SchemaRouter

MySQL [(none)]> show table status from some_schema;
ERROR 1049 (42000): Unknown database 'some_schema';

This works:
USE some_schema;
SHOW TABLE STATUS\G

Relevant SchemaRouter config:

[MyShardingService]
type=service
router=schemarouter
auth_all_servers=true
targets=Shard01,Shard02
user=my_maxscale_user
password=my_secure_password
ignore_tables_regex=/^performance_schema/|/^information_schema/|/^mysql/|/^sys/
refresh_interval=24h