Comment # 2 on bug 1200895 from Michael Pujos

Instructions for downgrading until it is fixed:


zypper in -f
https://download.opensuse.org/history/20220624/tumbleweed/repo/oss/x86_64/python310-msgpack-1.0.3-1.3.x86_64.rpm

lock the package (don't forget to unlock at some point):

zypper al python310-msgpack