Kea DHCPv4 not successful running after update (dnsmasq/ISC re-enabled)

[Gisy]

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Describe the bug
After updating to OPNsense 25.7.10, Kea DHCPv4 stopped handing out IPv4 addresses, while IPv6 still worked. In the GUI Kea DHCPv4 is enabled for my VLAN bridges, but the Kea log only shows kea-dhcp6 entries.

Findings

sockstat -4 | grep 67 showed dnsmasq listening on UDP port 67 after the update, no kea-dhcp4.

ISC DHCPv6 was also enabled again on one interface, although it was disabled before the update.

After disabling dnsmasq and ISC DHCPv4/v6 again, Kea DHCPv4 started correctly and now listens on 192.168.10.1:67 and 192.168.30.1:67, and IPv4 leases work immediately.

Environment

OPNsense 25.7.10 (amd64)

Kea DHCPv4/v6 enabled, dnsmasq and ISC DHCP supposed to be disabled

[sopex]

Where did you update from? 25.7.9?

Disable ISC and dnsmasq (also delete their configuration entries) and restart kea/opnsense.

[Gisy]

Yes, from 25.7.9.
I already stopped DNSMasq (it didn´t run before the update) and everything is fine again. Dunno, why DNSMasq have been started after update. I used isc until i changed to kea.