Maintenance plans store the database connection information inside the package. So yes, when you clone a server all maintenance plans on the new system will have a connection to the old server - and will run against that old system.
You cannot change the connection information - so you need to delete the maintenance plans on the new system and recreate them.
Jeffrey Williams
“We are all faced with a series of great opportunities brilliantly disguised as impossible situations.”
― Charles R. Swindoll
How to post questions to get better answers faster
Managing Transaction Logs