Comment 2 for bug 1899372

So, /etc/os-release is an obsolete file location, which is normally a symlink to /usr/lib/os-release.

When mounting snapshots, the grub script doesn't parse /etc/fstab; to mount the snapshots of where the /usr is, and mount that.....

However, I don't know how having /usr as a subvolumen (if that is the right term) even supported or usable with zsys.

What do you mean by /usr is a separate filesystem? which filesystem is it?

We only support zsys when everything is managed by it.