Comment # 3 on bug 1202438 from Hansi Meir

Please remember my first statement: it works until version 25, it fails since
version 26. So of course I've installed version 25 currently.


To your hints:

1. in UEFI-BIOS I can see both NVMe in the menu where I can select the boot
order. So both NVMe should be bootable.

2. I entered grub command line from boot menu with version 25:

2.1 
grub> ls shows both NVMe devices as (hd0) and (hd1) and all partitions on both.
The rescuezilla.iso is in (hd1,gpt5). So I started with

grub> ls (hd1,gpt5)   that shows long technical data with fs, mod time, UUID,
startpoint and capacity.

Then I continued with 

grub> ls (hd1,gpt5)/boot/iso/rescuezilla.iso 
     with this result:

rescuezilla.iso
grub>


3. Now I installed grub version 27 and repeated the procedure

3.1  same result as 2.1 with
grub> ls 
and
grub> ls (hd1,gpt5) 

But
grub> ls (hd1,gpt5)/boot/iso/rescuezilla.iso 
      now shows an error:

error: ../../grub-core/kern/mm.c:372:out of memory


That confirms my assumption: 
since version 26 something has changed and it's not a problem on my notebook.


Meanwhile version 25 is active again and everything works fine.