The previous pkgsrc version was 2.4.9. However, I've just tested 2.5.14 and saw the same behaviour (so I guess there is no point in testing 2.5.16).

For now I'll commit the following German translations, fixing spelling plus other slight changes:

Do you remember wether you had the same problem also with 2.5.14 or 2.5.16? Or can you test with these versions? Which version of libgpg-error are you using?

When I kill the gpg process, I see:

("/tmp/security/gnupg2/work/gnupg-2.5.17/g10/gpg" --no-permission-warning --no-greeting --no-secmem-warning --batch "--agent-program=/tmp/security/gnupg2/work/gnupg-2.5.17/agent/gpg-agent|--debug-quick-random" --list-sec
ret-keys) failed: gpg: starting migration from earlier GnuPG versions

My actual plan is to rework the imp[ort/export of secret keys to gpg-agent. Right now gpg-agent has knowledge of OpenPGP for import/export. This is not good and the required conversion should be moved to a helper tools for easier testing and to have this out of the gpg-agent process. For Kyber we right now don't use any conversion mut store the secret keys in gpg-agent's native format. Thus the passphrase is not necessary. We need to figure out why we have this problem here.