Build 6970 (Jan 31, 2019)

I've deleted 2 domains consuming 736mb of disk space within SmarterMail.  Confirmed they were removed from SmarterMail, yet their directory structure and space usage still existed on the storage partition.  Is there a cleanup function that is suppose to come thru and remove these folders?  Is it immediate or on a schedule?  I do get a 'Collection was Modified. Enumeration may not execute' error when deleting a domain on this new build.