port-amd64/55276: -current bootloader can't locate specified gpt labels to boot

[mlh%goathill.org@localhost]

>Number:         55276
>Category:       port-amd64
>Synopsis:       -current bootloader can't find specified gpt partition labels to load
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue May 19 01:05:00 +0000 2020
>Originator:     mlh%goathill.org@localhost
>Release:        NetBSD -current bootloader 85048 Mar  2 /boot
>Organization:
        
>Environment:
System: NetBSD tiamat 9.99.63 NetBSD 9.99.63 (HDMIAUDIO) #5: Mon May 18 08:28:35
EDT 2020 
Architecture: x86_64
Machine: amd64
>Description:
Bootloader "boot NAME=partition_label" for a gpt partition doesn't work even
though
bootloader "dev" finds the labels:

> dev
disk hd0 size 3726 GB 
  NAME=boot_h1(NetBSD FFS) NAME=swap_h1(NetBSD Swap) NAME=root_h1(NetBSD FFS
...
> boot NAME=root_h1
open NAME=root_h1: No such file or directory
boot: NAME=root_h1:NAME=root_h1: No such file or directory

rename label to rooth1 to remove '_' in case special chars prevent operation
> boot NAME=rooth1
open NAME=rooth1: No such file or directory 
boot: NAME=rooth1:NAME=rooth1: No such file or directory

>How-To-Repeat:
>Fix:
> boot -a
select dk2 (rooth1)
...
works