After upgrading to SSB 6.5.0 the following error is reported when attempting to export a newly created ruleset in SSB > Log > Pattern Database.
This issue with the Pattern Database rules has been fixed in SSB 6.6.0 which can be downloaded from the support portal on or after 25 April 2021
It is referenced in the release notes under the Resolved issues section
SSB-3310 - Fixed disappearing of new Pattern Database rules
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