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To accommodate the change away from ISC-DCHP defaults the "Track interface" IPv6 mode now has a sibling called "Identity Association" which does the same except it is not automatically starting ISC-DHCPv6 and Radvd router advertisements to allow better interoperability with Kea and Dnsmasq setups. Dnsmasq is now the default for DHCPv4 and DHCPv6 as well as RA out of the box. One thing that the upstream software cannot cover is prefix delegation so that is no longer offered by default. Use another DHCPv6 server in this case.

I'm trying to figure out what I've to change in my setup related to the statements above. When it was first mentioned that ISC-DHCP will be deprecated I already moved my stuff over to using "Dnsmasq DNS & DHCP" like the DHCP ranges for my home and guest vlans as well as the reservations / host overrides. So after updating to 26.1 today I uninstalled the os-isc-dhcp plugin, so far so good, things still appear to work as intended. However when trying to change the "IPv6 Configuration Type" in either my home or guest vlan/interface from "Track Interface (legacy)" to  the new "Identity association" and try to save the changes I get an error message:

The following input errors were detected:

The DHCPv6 Server is active on this interface and it can be used only with a static IPv6 configuration. Please disable the DHCPv6 Server service on this interface first, then change the interface configuration.

I came across the same issue with the warning message about DHCP server being active. The way to resolve it is to temporarily install the ISC plugin, (DHCPv6 I think was active on the LAN), then you can make the changes. It seems the wrong way round, but must be a bug, when done of course ISC plugin can be removed.

This worked for me, hoe it helps you too.