Steps to reproduce:

Upgrade to latest zabbix version.

{}Problem description:{}

Tried to upgrade to latest zabbix version today: 1:6.4.9-1+debian12. While doing upgrade noticed interesting warning:

Setting up zabbix-frontend-php (1:6.4.9-1+debian12) ...
chown: warning: '.' should be ':': ‘www-data.root’

I guess this needs to be fixed as for now frontend has root:root and looking at the warning I suspect it needs to have www-data:root.