I tried your settings, this is before reboot:

$ sudo pvdisplay 
  --- Physical volume ---
  PV Name               /dev/mapper/mpath1-part1
  VG Name               vg0
  PV Size               2,00 TB / not usable 1,23 MB
  Allocatable           yes (but full)
  PE Size (KByte)       4096
  Total PE              524287
  Free PE               0
  Allocated PE          524287
  PV UUID               znfa6r-X7FD-VXTd-WdsJ-LAu2-8SdS-relheA

I created a PV and a LV: /dev/vg0/lv0,  /dev/mapper/mpath1-part1 is
present.

After reboot, /dev/vg0/lv0 is still there, but /dev/mapper/mpath1-part1
has disappeared and /dev/mapper/vg0-lv0 is showing up.

"pvdisplay" and "multipath -ll" give no output but /dev/vg0/lv0 can be
mounted (probably using only one static path)

I used your "devices" part in /dev/lvm/lvm.conf and my
/etc/multipath.conf contains only "defaults { user_friendly_names yes
}".

If you want to run more tests,  go ahead, I'm using a sandbox blade
server.

-- 
udev breaks multipath after reboot when using LVM
https://bugs.launchpad.net/bugs/230006
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