RAID configuration form keeps state

Trying to create a RAID from the UI, I ran into an issue where it seems the UI keeps state from previous selections in the creation form.

These are the steps I took:
- selected 5 empty disks from a machine storage tab
- select create raid
- select RAID 1 as level
- select a couple of disks as spare
- select RAID 0 as level
- apply

The following error message shows: "RAID level 0 must have at least 2 raid devices and no spares"

This is the message that gets sent:

{
 "method": "machine.create_raid",
 "type": 0,
 "params": {
  "level": "raid-0",
  "name": "md0",
  "system_id": "dy3sse",
  "tags": [],
  "block_devices": [
   179,
   180,
   181
  ],
  "spare_devices": [
   177,
   178
  ]
 },
 "request_id": 12
}