OpenVPN warning: IP packet with unknown IP version=0 seen

[opn_support]

I'm getting the following warning on the OpenVPN server: IP packet with unknown IP version=0 seen

Connection setup -> accomplished
OPNSense: 22.7.2 (also on previous versions)
OpenVPN client: 2.5.7

any idea how-to resolve this warning?

[bartjsmit]

Could be a spurious warning. Run a packet trace and see if you can spot it?