This is certainly a bug, but it is user error to configure an LVM volume as the prep partition; the prep partition must be a disk partition visible from firmware.
I believe this bug does not occur when using guided partitioning.
This is certainly a bug, but it is user error to configure an LVM volume as the prep partition; the prep partition must be a disk partition visible from firmware.
I believe this bug does not occur when using guided partitioning.