FreeBSD: the base version 12 does not build

In my test, the build is failing:

==> base.qemu.freebsd: Retrieving ISO
==> base.qemu.freebsd: Trying http://ftp.freebsd.org/pub/FreeBSD/releases/ISO-IMAGES/12.2/FreeBSD-12.2-RELEASE-amd64-disc1.iso
==> base.qemu.freebsd: Trying http://ftp.freebsd.org/pub/FreeBSD/releases/ISO-IMAGES/12.2/FreeBSD-12.2-RELEASE-amd64-disc1.iso?checksum=sha256%3A289522e2f4e1260859505adab6d7b54ab83d19aeb147388ff7e28019984da5dc
==> base.qemu.freebsd: Download failed bad response code: 404
==> base.qemu.freebsd: error downloading ISO: [bad response code: 404]
Build 'base.qemu.freebsd' errored after 261 milliseconds 751 microseconds: error downloading ISO: [bad response code: 404]