install/60133: 11.0_RC2 fails install with "Release set base32 does not exist."

["jmcneill%invisible.ca@localhost via gnats" <gnats-admin%NetBSD.org@localhost>]

>Number:         60133
>Category:       install
>Synopsis:       11.0_RC2 fails install with "Release set base32 does not exist."
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Mar 26 10:05:00 +0000 2026
>Originator:     Jared McNeill
>Release:        netbsd-11/20260308105915Z
>Organization:
>Environment:
amd64 daily build netbsd-11/20260308105915Z
>Description:
Installing in a VM from NetBSD-11.0_RC2-amd64.iso, selecting install everything, the install failed with "Release set base32 does not exist."
>How-To-Repeat:
Install on amd64 from NetBSD-11.0_RC2-amd64.iso using legacy BIOS (I did not try UEFI). Use GPT partition, install from CD/DVD device, default partitioning, select all sets.
>Fix:
Unknown