Hi,
Look at this output on a newly installed Leap 15.2 system:
arlos@Rescate:~> grep chrony /var/log/messages
2020-09-04T01:55:00.304034+02:00 install chronyd[1465]: chronyd version 3.2 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP -SCFILTER +SECHASH -SIGND +ASYNCDNS +IPV6 -DEBUG)
2020-09-04T01:55:12.502311+02:00 install chronyd[1465]: Selected source 185.132.136.116
2020-09-04T01:56:16.829596+02:00 install chronyd[1465]: Selected source 178.255.228.77
2020-09-04T01:59:30.696451+02:00 install chronyd[1465]: Selected source 185.132.136.116
2020-09-04T02:25:17.504984+02:00 install chronyd[1465]: Source 2606:4700:f1::123 replaced with 2001:720:424:1::1:15
2020-09-04T02:55:08.658645+02:00 install chronyd[1465]: Source 2606:4700:f1::1 replaced with 2001:720:1014:a202::2
2020-09-04T03:25:01.548423+02:00 install chronyd[1465]: Source 2001:720:424:1::1:15 replaced with 178.32.88.247
2020-09-04T03:54:53.688796+02:00 install chronyd[1465]: Source 2001:720:1014:a201::2 replaced with 2606:4700:f1::1
2020-09-04T04:24:45.734513+02:00 install chronyd[1465]: Source 2001:720:1014:a202::2 replaced with 2001:720:424:1::1:15
carlos@Rescate:~>
Notice how chronyd is trying to use IPv6 addresses, when my home doesn't
have IPv6. The network is autoconfigured with DHCP (network manager) from
the ISP provided and configured router.
carlos@Rescate:~> ifconfig
eth0: flags=4163