Based on https://docs.ansible.com/ansible/latest/reference_appendices/config.html#ansible-ssh-args the ssh args is by default set to "-C -o ControlMaster=auto -o ControlPersist=60s". In 2e11f6810d8b4e7e8ce28f91bdf6a534c0f3e2f4, this was overridden to "-o ProxyCommand=none" only. There seems to be no way to just append arguments, so listing defaults here is probably the best option.
Related issues
Bug #28559: Hardcoding Proxy Command breaks running Ansible on Debian
Fixes #28559 - keep default ssh args (#554)
Based on https://docs.ansible.com/ansible/latest/reference_appendices/config.html#ansible-ssh-args
the ssh args is by default set to "-C -o ControlMaster=auto -o ControlPersist=60s". In
2e11f6810d8b4e7e8ce28f91bdf6a534c0f3e2f4, this was overridden to "-o
ProxyCommand=none" only. There seems to be no way to just append arguments, so
listing defaults here is probably the best option.