Dom0 under Debian: Update Grub2 to 2.06-3 breaks PVH boot

[Paul Leiber <paul@xxxxxxxxxxxxxxxx>]

Hi everybody,

today, I updated my Debian Xen Dom0 using apt. The update of grub to 
version 2.06-3 breaks PVH DomU boot, the DomU gets created and 
immediately crashes. Downgrading grub to version 2.04-20 on the Dom0 
restores a working system. Updating the DomU grub version seems to be 
fine. More information can be found here:
https://groups.google.com/g/linux.debian.bugs.dist/c/-jMvBlsmV3s

Best regards,

Paul