Cannot build with mock for rawhide on Fedora 30

Hi all, I'm facing an issue with the package signatures on Fedora when trying to build in rawhide chroot: $ mock -r fedora-rawhide-x86_64 --shell [...] Public key for zstd-1.4.2-1.fc31.x86_64.rpm is not installed. Failing package is: zstd-1.4.2-1.fc31.x86_64 GPG Keys are configured as: file:///usr/share/distribution-gpg-keys/fedora/RPM-GPG-KEY-fedora-31-primary, file:///usr/share/distribution-gpg-keys/fedora/RPM-GPG-KEY-fedora-30-primary Error: GPG check FAILED I cleaned the mock cache, deleted the old chroot and also checked that my mock config is up-to-date (no .rpmnew files), to no avail. Any idea what's causing this? Thanks! Till