Yes, that is specifically why I went to look for the NULLCONSOLE flag that the devs mentioned they were patching into OPNsense in 2016. The thread seemed to unanimously agree this was a bug with the then version of BSD, and, given it was first reported 4 years ago, it seemed reasonable to expect that there might be another alternative to buying a dummy cable connector.
I'll reference the BSD documentation to look for a solution to this.
I'll reference the BSD documentation to look for a solution to this.