FreeBSD machines preferring ipv4

Hello,

My FreeBSD computers always choose ipv4 over ipv6 and I can not figure out why. There is nothing special in the network configuration; IPs are set by dhcp.
The exact same machines, booted under gentoo (linux) (I even installed windows for another test), do use ipv6 over ipv4, which makes me believe that the problem is with FreeBSD, but who knows....

For information, the IP addresses are provided by isc-dhcpd for ipv4 and rtadvd for ipv6.

I am looking for advice on what to check.
 
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