Same steps on RHEL-9.2.0-20230126.18 could reproduce.

+++ This bug was initially created as a clone of Bug #2165290 +++

Description of problem:
Trying to install the OS with RAID1 on vdx disks.

Version-Release number of selected component (if applicable):
guest OS: RHEL-8.8.0-20230127.0

How reproducible:

Steps to Reproduce:
1.Create VM with 4 vdx disks (vd[a-d])
2.Boot the VM with that RHEL-8.8.0-20230127.0 ISO.
3.Click into the "Installation Destination" page
4.On the "Installation Destination" page, in "Local Standard Disks" field, Check "vda" "vdb", In the bottom "Storage Configuration" field , Chose "Custom", then click left upper "Done" button going into "Manual Partitioning" page.
5.In the "Manual Partitioning" page, select "Standard Partition" in the drop down list. Then Click "Click here to create them automatically".
6.Waiting for auto create finished, make sure "/boot" is highlighted. On right side Select "RAID" from "Device Type" 's drop down list. Make sure the popup "RAID Level" is "RAID1"
7.Click "Update Settings".

Actual results:
Anaconda give out an Error Said:
"Device reconfiguration failed. Click for details."
When click , pop window said:
"raid1 requires at least 2 disks"

Expected results:
Anaconda will change the device type to RAID1 on "/boot"

Additional info:
When Changing the "Device Type" , sometime just don't click the "/boot" first, it will go though.