Original Sophos KBA: https://support.sophos.com/support/s/article/KB-000038813?language=en_US
This is wrong:
Changing the load balancing to Session-Persistant
console> set routing wan-load-balancing session-persistant <connection-based/destination-only/source-and-destination/source-only> ip-family <all/ipv4/ipv6>
With V20.x this should be:
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