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The summary is my tentative diagnosis, which could be wrong.

I attempted an install of Tumbleweed 20190502, using an LVM with thin
provisioning (for "/" and "/home").  This was mainly an experiment for my own
learning experience.

Everything seemed to go fine until installing the boot loader.  And then there
were several errors.  And, after install, the system would not boot.

It looks as if "grub2" cannot hand a thinly provisioned volume.

I repeated the install, but on the second try I used a separate "/boot"
partition.  And everything went fine for that second install.

My recommendation on how to deal with this:

(1) document the problem in "release-notes".
(2) close the bug as WONTFIX

I'm not about to retry.  But I suspect that the system would have booted if I
had copied "grub.cfg" from "/boot/grub2/" to "/boot/efi/EFI/opensuse/".

Reproducible: Always