IPv6 Delegated Prefix not getting updated

[guest28623]

I have a current OPNsene behind my ISP router.

The router gets a /56 IPv6 prefix, which changes every day!
My OPNsense is configured to get a /58 prefix from the router via DHCPv6 "Request only an IPv6 prefix", which works.
In the overview I see the delegated prefix.

Now the problem: Every night the prefix changes.
OPNsense gets a new IP immediately, but the delegated prefix does not get updated. (Attachment image)

When I reload DHCP manually the prefix gets updated.
Can this be done automatically?