RAID/ZFS-pool-creation - Hot plugged drives/not all drives cannot be selected for creating RAID or ZFS Pool

Hi,
after a fresh install of OMV4.1.3, update to 4.1.4, installation of extras plugins, zfs plugin, i played with hot plug of the drives (/dev/sd[b-e]).

so i

• booted without data drives,
• inserted the data drives,
• clicked "update" to see the drives (yeah it worked - after setting the BIOS correctly)
• tried to create a "ZFS pool -> no drives are shown...???
  Note: not even one disk is used by the system,
• rebooted the system (all data drives are plugged in)
• tried to create a "ZFS pool -> no drives are shown...???
• (fast) wiped all data drives
• now ist changed:
  
  
  • i can see all 4 data drives in the "create file system" Dialogue
    but...
  • only 2 drives (/dev/sda and drive /dev/sdb) are available for zfs pool creation ??
  • same for RAID creation..
    - only 2 drives (/dev/sda and drive /dev/sdb) are available

As i can see:

• a drop box is used for "File System Creation"
  this works
• a list box (?) is used for "RAID creation" and "ZFS pool creation"
  this let me see only 2 of 4 drives

in general, i like to see drives in the list, even i am not allowed to use them - they may be grey.
(so i can see, they are detected, but used... - an additional tool tip or comment would be great in this case)

following the screenshots of the disks after the hot-plug and the ZFS pool creation dialog.

the zfs pool creation dialog

only 2 Drives are available for RAID creation:

all Drives are available for file system creation:

is that the ecpected behavior? do i miss something?

My Hardware configuration:

• Asrock Z270 Gaming-ITX/ac
• M.2 sata ssd, 16 GB
• Celeron G3930
• 8G DDR4 RAM
• Silverstone DS380 case
• some old disks for testing..

Thanks for reading and Best Regards,
Bernd