As a datapoint, I got a VM from a low-end VPS provider, and it came configured exactly this way; lvm with UUID in fstab. I can reproduce the bug by reimaging the VM and upgrading it from stable to unstable.
This configuration doesn't make much sense. However, there are many possible configurations that don't make much sense, and leaving the user with an unbootable system on upgrade is not the experience Debian strives for. -- see shy jo
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