Centos7 uefi boot problem with bhyve after update

[Michael Reifenberger]

Hi,
Im running a Centos7 bhyve VM under FreeBSD-11 (latest stable).
The VM boots using UEFI: uefi-edk2-bhyve-0.1
Centos was installed and ist booting fine: CentOS Linux release  
7.3.1611 (Core)

/boot and /boot/efi are on a extra zvol:
...
/dev/vda2                  1014M  193M  822M  20% /boot
/dev/vda1                   100M  9.5M   91M  10% /boot/efi
...

Now if updating to the latest Centos packages the VM doesn't boot anymore.
The relevant screenshot ist attached, and can be found here:  
https://ibb.co/jFwDES
Reverting the VM to the previous state solves the boot issue.

Is this a known problem?
How to resolve?


BTW:
A new installation of a recent Centos fails after the  
installation/reboot with the same error.
Other Linux distros (Ubuntu) seem to be affectet too...

Greetings
---
Mike

Gruß
---
Michael Reifenberger