LiteSpeed Maintenance Plans retain one more backup than native plans.
Steps to reproduce:
1. Create a native maintenance plan that runs every minute. Configure to delete backups older than 2 minutes.
2. Let the plan run for a few minutes and verify that it only keeps 2 backups in the backup directory.
3. Convert the plan in the Enterprise Console.
4. Let the plan run a few more minutes and you should see that there are now always 3 backups rather than 2.
Fixed in Version 22.214.171.12468