Tor with new ipv6 only works after a restart

A relay operator reported that every day their relay changes the IPv4 and IPv6 addresses. But while Tor with IPv4 works automatically, for IPv6 connection, they need to restart the service.

Auto-discovered IPv6 address [1111:::ffff]:9001 has not been found reachable. However, IPv4 address is reachable. Publishing server descriptor without IPv6 address. [2 similar message(s) suppressed in last 2400 seconds])

Tor version

0.4.7.10.

torrc

SocksPort 0
Log notice file /var/log/tor/notices.log
DataDirectory /var/lib/tor
ControlPort xxxxx
HashedControlPassword xxxxx
ORPort 9001
Nickname justme
RelayBandwidthRate 250 KB  # Throttle traffic to 100KB/s (800Kbps)
RelayBandwidthBurst 750 KB # But allow bursts up to 200KB/s (1600Kbps)
ContactInfo me@there.net
DirPort 9005
ExitRelay 0
ExitPolicy reject *:* # no exits allowed

Forum link

https://forum.torproject.net/t/ipv6-with-dynamic-prefix-behind-nat/5296