All `ssh` command (including `git clone git:...`) failed when a symlink exists in `/usr/lib/systemd/ssh_config.d`

[finnvyrn]

> fence ssh root@zongshu-router
Bad owner or permissions on /etc/ssh/ssh_config.d/20-systemd-ssh-proxy.conf
> sudo ls -la /etc/ssh/ssh_config.d/20-systemd-ssh-proxy.conf
lrwxrwxrwx 1 root root 63 May 28 14:50 /etc/ssh/ssh_config.d/20-systemd-ssh-proxy.conf -> ../../../usr/lib/systemd/ssh_config.d/20-systemd-ssh-proxy.conf
> sudo ls -la /usr/lib/systemd/ssh_config.d/20-systemd-ssh-proxy.conf

-rw-r--r-- 1 root root 807 May 28 14:50 /usr/lib/systemd/ssh_config.d/20-systemd-ssh-proxy.conf

Related:

• Git push --dry-run fails with Bad owner or permissions on /etc/ssh/ssh_config.d/... (SSH config owned by nobody inside sandbox) · Issue #9286 · openai/codex
• systemd-ssh-proxy in systemd-256 / System Administration / Arch Linux Forums