In WP logs, TLS_GATEWAY_CP is set to Y even if it has not been set in UC_SYSTEM_SETTINGS; so it is defaulting to Y:
20220606/032517.441 - 20220602/075746.649 - U00011847 'TLS_GATEWAY_CP' set to 'Y'.
According to https://docs.automic.com/documentation/webhelp/english/ALL/components/DOCU/21.0.3/Automic%20Automation%20Guides/Content/AWA/Variables/UC_SYSTEM_SETTINGS/UC_SYSTEM_TLS_GATEWAY_CP.htm it should be set to N by default:
Release : 21.0.2
Component : AUTOMATION ENGINE
This will be fixed will 21.0.4
Workaround: explicitly set TLS_GATEWAY=N in UC_SYSTEM_SETTINGS