This is wanted behaviour because it's easy to mistake and kill a pv that's part of a vg etc. It's an extra safety switch to avoid unwanted data loss.
Fabio
** Changed in: partman-auto-lvm (Ubuntu)
Status: Needs Info => Rejected
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d-i partitioner won't allow you to automatically partition LVM if you have
existing LVM
https://launchpad.net/bugs/46344
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