/usr/lib/gnupg2/gpg-preset-passphrase is in gpg-agent 2.2.4-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gnupg2/../gnupg/gpg-preset-passphrase
/usr/lib/gnupg2/../gnupg/gpg-preset-passphrase