Bookworm - broken update? (mariadb-common)

["Gareth Evans" <donotspam@fastmail.fm>]

Hello,

$ cat /etc/debian_version
12.10

An automated apt update/upgrade failed last night.  On trying again, I get:

$ sudo apt update; sudo apt upgrade
<snip>
Preconfiguring packages ...
48 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 0 B/133 MB of archives.
After this operation, 474 MB of additional disk space will be used.
Setting up mariadb-common (1:10.11.11-0+deb12u1) ...
update-alternatives: error: alternative path /etc/mysql/mariadb.cnf doesn't exist
dpkg: error processing package mariadb-common (--configure):
 installed mariadb-common package post-installation script subprocess returned error exit status 2
Errors were encountered while processing:
 mariadb-common
E: Sub-process /usr/bin/dpkg returned an error code (1)


/etc/mysql/mariadb.cnf doesn't exist on my system, but is provided within the package:

$ ls /etc/mysql/*cnf
/etc/mysql/debian.cnf

$ dpkg -x /var/cache/apt/archives/mariadb-common_1%3a10.11.11-0+deb12u1_all.deb ~/deb
$ dpkg -e /var/cache/apt/archives/mariadb-common_1%3a10.11.11-0+deb12u1_all.deb ~/deb
$ ls ~/deb/etc/mysql/*cnf
/home/user/deb/etc/mysql/mariadb.cnf

$ tail ~/deb/postinst
    # Thus, we need to ensure here that mariadb.cnf indeed became the primary
    # alternative and override with priority 500 if needed.
    if ! update-alternatives --query my.cnf | grep --quiet "Value: /etc/mysql/mariadb.cnf"
    then
      update-alternatives --install /etc/mysql/my.cnf my.cnf "/etc/mysql/mariadb.cnf" 500 || true
    fi
  ;;
esac

Isn't this supposed to add/replace mariadb.cnf from the package into /etc/mysql/?

FWIW:

$ update-alternatives --query my.cnf | grep --quiet "Value: /etc/mysql/mariadb.cnf"
update-alternatives: warning: alternative /etc/mysql/mariadb.cnf (part of link group my.cnf) doesn't exist; removing from list of alternatives
update-alternatives: warning: alternative /etc/mysql/my.cnf.fallback (part of link group my.cnf) doesn't exist; removing from list of alternatives

Has anyone else seen this?

Thanks,
Gareth