grub_2 V 2.04 doesn't sattisfie as V 2.02 did using it as "stand-alone"

[Reinhard]

I use grub as stand-alone, that is, I
1. create a "bios_grub", a "esp" and a third partition for an iso-file on a flashkey (trying even different ones)
2. generate a hybrid MBR (gdisk)
3. install grub into "esp" with its own grub.cfg
4. install grub to "bios_grub"/device also with its own grub.cfg
Starting this stick in either "EFI-" or CSM mode, it's booting as expected into the corresponding grub menu.

Putting an iso-file (focal-desktop-amd64.iso) onto the stick, creating a menuentry

 menuentry "focal-desktop-amd64" {
   set root=(hd0,gpt3)
   loopback loop /focal-desktop-amd64.iso
   linux (loop)/casper/vmlinuz boot=casper ramdisk_size=2097152 root=/dev/ram rw locale=de_DE bootkbd=de console-setup/layoutcode=de iso-scan/filename=/focal-desktop-amd64.iso
   initrd (loop)/casper/initrd
}

booting into focal will work when PC in CSM mode, doesn't work when in EFI mode. Looks like freezing (cursor doesn't flash)

Every thing above works fine when using with grub 2.02

I am just checking this site (https://wiki.ubuntuusers.de/Universal_stand-alone_grub_f%C3%BCr_BIOS_und_EFI_auf_USB_flashkey_und_internen_HDD_und_SSD/) for use with focal, using a livesytem

[Radosław Piliszek (yoctozepto)]

Uhm, are you sure you are targetting the right project with this bug report? Kolla is about providing container images for OpenStack deployments. None of these seem close. :-)

[Reinhard (reinhard-u-schmidt)]

your are right, my fault, I'm not familiar with this bugtracker
At least it could be wiped out. It was my fault I forgot inserting "insmod part_gpt". everathing works fine.