Backups configured with expiration date set to above 252 months show expiration as never in explore storage, examine save set window. Then if the backup expiration is modified manually in the explore storage, examine save set window the expiration date gets set to a negative value or never.
If you wish for the save set to expire modify the date to be 21 years i.e. 252 months. If you want the backup not to expire in this time frame but later leave the backup expiration to never and modify the expiration date when the bug has been addressed.
