I'm not sure exactly where your system is stopping, but I just went through an issue moving a system yesterday, so maybe this will help.
If your system is booting in UEFI mode (running "efibootmgr" shows boot entires), there's an extra file that needs to be updated that I don't think is clearly documented anywhere, nor is there a command to updated it. That is /boot/efi/EFI/fedora/grub.cfg. It searches for the /boot partition by UUID.
To find the correct UUID, I believe this will work:
- boot a Live image from USB - select Troubleshooting at the boot menu and choose Rescue - at the prompt, choose to mount the system - in the shell, run: chroot /mnt/sysimage - find the correct UUID with: lsblk -o UUID,MOUNTPOINT | grep ' /boot$' - edit /boot/efi/EFI/fedora/grub.cfg and put that UUID on the "search" line
I'm not sure that this is clearly documented anywhere, and I don't think there's any command to update that file easily (unlike regenerating the main grub.cfg with "grub2-mkconfig -o /etc/grub2.cfg").