IRCd via JSEXEC crashes when run in environment without IPv6

When running ircd via SBBSEXEC in an environment without IPv6 (such as default docker configurations), the script crashes.

!IRCd ERROR -9 calling getaddrinfo() on ::
!Error Error: Unable to add host to socket set creating listening socket on port 6667
!Module (/sbbs/exec/ircd.js) set exit_code: 1

I attempted to force a PLine entry (P:0.0.0.0:::6667), but still seeing the same error.

ASIDE: this also happens with SBBS executable as well, with default configuration, which is easy enough to change the sbbs.ini for.