Im not sure if I understand right: You take a zfv-Volume to create a lvm volume inside? Make it sense to mix two similar concepts in this way? Imho zfs and lvm are focussed to different goals, so if you combine it, you get the worse of both.
What is your goal mixing these concepts? If you have created a zfs-volume, you can mount it directly without detouring over lvm and vice versa.
I think it is much better to decide for one of these (zfs-volumes XOR lvm-Volumes) depending on your needs.
Just my 2ct