fibs broke route add default?

From: Steven Friedrich <freebsdlouisville_at_gmail.com>
Date: Sat, 25 May 2024 01:08:47 UTC
route add default 192.168.1.1 returns an error:

add net default: gateway 192.168.1.1 fib 0: Invalid argument

This command is taken from the route man page.

How can I fix this?