reproduce problem with buildep and local repo

reproduce.sh

#!/bin/sh
set +ex
toolbox rm -f test-fc39 -y || true
toolbox create test-fc39 --distro fedora --release 39 
toolbox run -c test-fc39 sudo dnf install createrepo -y
toolbox run -c test-fc39 sudo dnf download  --downloaddir ./dir4rpms --arch=x86_64  --arch=x86_64 --arch=noarch --resolve mpv -y
toolbox run -c test-fc39 sudo dnf builddep --downloadonly --downloaddir ./dir4rpms mpv -y  
toolbox run -c test-fc39 createrepo ./dir4rpms
toolbox run -c test-fc39 sudo bash -c 'sudo echo -e "[offline]\nname=offline\nbaseurl=file://$PWD/dir4rpms/\nenabled=0\ngpgcheck=0\nrepo_gpgcheck=0\n" > /etc/yum.repos.d/offline.repo'

# install ok from offline repo
toolbox run -c test-fc39 sudo dnf install --refresh --nogpgcheck --disablerepo="*" --enablerepo="offline"  -y --allowerasing mpv

# cannot find mpv — «no package matched: mpv»
toolbox run -c test-fc39 sudo dnf builddep --refresh --nogpgcheck --disablerepo="*" --enablerepo="offline"  -y --allowerasing mpv