We have account numbers we store in a custom text field in the format 1-123456-123456-123456-123456. A search for 12345 in the 'Custom Field' section of the Find Issues panel brings up zero hits. This is the same when we enter 12345 in the Query field under Text Search. I've even tried attempting using wild cards to no avail. I attempted a search on a different custom text field that came up fine.