Unresolvable package postgresql-common-dev in latest pg12 package

Hi,

I'm trying to install the build-deps for postgresql-12 with the following, using the pgdg packages at
apt.postgresql.org:

mk-build-deps postgresql-12
apt install -y ./postgresql-12-build-deps*.deb

And I'm getting the following error:

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Note, selecting 'postgresql-12-build-deps' instead of './postgresql-12-build-deps_12.22-2.pgdg22.04+1_amd64.deb'
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 postgresql-12-build-deps : Depends: postgresql-common-dev but it is not installable

Apparently the 12.22 version has a Build-Depends on 'postgresql-common-dev', which is not available in the package
repository.Previous versions specified 'postgresql-common'. 

Is this an oversight, or am I doing something wrong?

Kind regards,
James Guthrie