Blivet does not show RAID partition device in the DeviceTree.

This is the relevant part from the journal (attach whole journal as well)

DEBUG:blivet:                    DeviceTree.get_device_by_name: name: SOMERAID1 ; incomplete: False ; hidden: False ;
DEBUG:blivet:                    DeviceTree.get_device_by_name returned None
DEBUG:blivet:                   PartitionDevicePopulator.run: name: SOMERAID1 ;
DEBUG:blivet:                     DeviceTree.get_device_by_name: name: SOMERAID1 ; incomplete: False ; hidden: False ;
DEBUG:blivet:                     DeviceTree.get_device_by_name returned None
INFO:program:Running... udevadm settle --timeout=300
DEBUG:program:Return code: 0
DEBUG:testdata:sysfs attr /sys/class/block/sr0/device/model: 51454d55204456442d524f4d202020200a
DEBUG:blivet:                     DeviceTree.get_device_by_name: name: SOMERAID ; incomplete: False ; hidden: False ;
DEBUG:blivet:existing RAID raid0 size == 29.98 GiB
DEBUG:blivet:                     DeviceTree.get_device_by_name returned existing 29.98 GiB mdarray SOMERAID (300) with existing  disklabel
DEBUG:blivet:existing RAID raid0 size == 29.98 GiB
ERROR:blivet:ignoring partition SOMERAID1 on SOMERAID: parted disk not found
DEBUG:blivet:no device obtained for SOMERAID1


Reproducible: Always

Steps to Reproduce:
1. Boot 42 workstation installer ISO 
2. have vda/vdb/vdc disks all empty
3. put biosboot and /boot on vda
4. create raid (level 1) in cockpit-storage (NAME SOMERAID)
5. delete the raid SOMERAID device
6. create raid (level 0) in cockpit-storage (NAME SOMERAID)
7. Put GPT table and create / partition on that

Actual Results:  

Try to return to installation and see this error:
 'You have not defined a root partition (/), which is required for installation of Fedora to continue.'

This is because SOMERAID1 partition is ignored by blivet as seen in the journal above.  

Expected Results:  
SOMERAID1 should not be ignored.

I have an automated test reproducer. I can help with extra debugging.