@giggls According to the linked email, it is caused by a Fedora/Red Hat-specific patch, which apparently is not included in Debian.
"Specifically, openssh-7.6p1-audit.patch found in Red Hat's package of
OpenSSH adds code to cleanup_exit() that exposes the issue. Relevantly,
this patch is found in RHEL 9 (and its rebuild/downstream
distributions), where the package is based on OpenSSH 8.7p1."