linux – install fedora 33 to external ssd disk did not boot

I tried to install fedora 33 on an external SSD.

What I did:

download fedora image and write it to an usb stick with:

sudo dd if=Downloads/Fedora-Workstation-Live-x86_64-33-1.2.iso of=/dev/sde bs=8M status=progress oflag=direct

works as expected. The stick boots fine and it looks like it worked in UEFI mode, but I am not sure.

I selected the external SSD as disk to install, everything to delete on that disk, Installation run without error. But after reboot and removing the usb stick, the SSD is not booted.

I have no idea what I can check in such a stupied simple case. Is there any chance to force the installer to install a normal mbr without uefi if uefi is the problem here?