If upgrading LiteSpeed 5.x or later, the Maintenance Plans should remain intact and no additional steps are required.
If upgrading LiteSpeed 4.x, the SSMS plug-in maintenance plans need to be manually upgraded. LiteSpeed allows you to read SSMS plug-in maintenance plans and upgrade them to SSIS LiteSpeed maintenance plans.
NOTE: The Remove files older than option in the Backup Database task does not remove LiteSpeed 4.x SSIS maintenance plans backups. To remove old backup files for these plans, you can use a separate Clean up maintenance plans task.
SSIS LiteSpeed plans must be manually upgraded to use the appropriate library, otherwise they will fail after SQL Server upgrade. If you have at least one LiteSpeed task in a SSIS plan, then you need to upgrade the plan after upgrading SQL Server to a higher version.
To upgrade plans in LiteSpeed 6.1 or later
Right-click an instance in the Maintenance Plan pane and select Upgrade LiteSpeed Maintenance plans.