install/57251: "No root petition defined. Cannot continue" during 9.2 macppc install

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>Number:         57251
>Category:       install
>Synopsis:       "No root petition defined. Cannot continue" during 9.2 macppc install
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Mar 01 03:55:00 +0000 2023
>Originator:     Chris Tucker
>Release:        9.2
>Organization:
self
>Environment:
Macppc
>Description:
Hello, I have a blue and white G3 Mac and I tried to install NetBSD 9.3 via CDROM and followed the NetBSD install notes (and also used this site https://e17i.github.io/articles-netbsd-install/ )

After partitioning disks for macos, root swap and usr and running newfs on the two ffs partitions and creating fstab, I ran the sysinstall "reinstall" option (due to OpenFirmware 3 on this mac). But right away the installer complained that "No root petition defined. Cannot continue"

I clearly had a / partition but when I used sysint's partition tools (I know you're not supposed to use these for OFW 3 machines but at this point I was ready to try anything) I noticed sysinst seemed to think my root drive was /mnt instead for some reason.

I repeated the process with NetBSD 9.2 and encountered the same error.
>How-To-Repeat:

>Fix: