[chaley]

I traced this down to the change in calibre offering that custom composite columns not be stored in the backup or book OPF. The jacket processor gets the column value from the OPF. If you uncheck the box "Store this column's value in an OPF" in the custom column definition then the column's content is not passed in that OPF, so they cannot be included in the jacket.

Re-check the box and it should work. It does for me.