I'm not sure, but I think:
20.4.2410 (2020-6-3) - Botnet protection - Web Shield can also block all connections to malicious servers. The functionality is in test mode for this release, which is expected to be full scale in the next release.
20.5.2415 (2020-7-2) - Better botnet protection - Web Shield is even better about stopping malware from connecting to malicious servers.