Hello Milan, I just tested an upgrade:

Unpacking isc-dhcp-server (4.4.1-2.1ubuntu5.20.04.2) over
(4.4.1-2.1ubuntu5) ...

and my /etc/default/isc-dhcp-server modifications had been left in
place.

The maintainer scripts will create a new one if the file cannot be read:
https://sources.debian.org/src/isc-dhcp/4.4.1-2.2/debian/isc-dhcp-server.postinst/#L33

(Debian sources, but Ubuntu's are very similar.)

Is it possible your old /etc/default/isc-dhcp-server could not be read?

Thanks

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https://bugs.launchpad.net/bugs/1930103

Title:
  isc-dhcp-server overwrites /etc/default/isc-dhcp-server during update

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