Proxy logs:

 received configuration data from server at "192.168.1.x", datalen 31234
 cannot process received configuration data from server at "192.168.1.x": unexpected field "config.timeout_zabbix_agent"

This started after zabbix server upgrade to "7.0.0alpha6", but proxy stayed at "7.0.0alpha1".

Upgrading both server and proxy to "7.0.0alpha9" makes no change, but now Zabbix frontend reports "Zabbix proxy last seen more than 600 seconds ago".

Sorry if this is normal in alpha please just say its not relevent and close.