Mongo restore on sharded cluster requires mongos restart

I have a sharded cluster using mongo 4.2.8 community with 3 mongos.

I successfully performed a mongodump / mongorestore with no errors, but when I logged into the other two mongos I had to shutdown and restart the mongos process to see the restored data. Although everything is working fine and there are no errors I was wondering if anyone had experienced this before?

mongo restore string: mongorestore --db=db_name --port=27017 -u user --authenticationDatabase admin /mongodumplocation