When customizing a VM in the CNV console, BIOS will be selected by default for "Boot Mode". If the VM is created, it will be configured with UEFI, not BIOS

4.17.1

Create a RHEL9 VM

1. Begin to create a VM from an instance type, such as u1.small
2. Click the Customize VirtualMachine button
3. Notice that "Boot Mode" is set to "BIOS"
4. Click the "Create VirtualMachine" button
5. Once the VM starts, go to the Configuration TAB of the VM
6. The "Boot mode" is now set to "UEFI (secure)", not BIOS

VM switches to UEFI (secure) when it boots for the first time

VM Boot Mode should be whatever was selected during VM creation

I assume that the Boot Mode is being changed by the VM preference, but if that's the case, the preference should be loaded during VM creation and those defaults should be displayed in the Console, not changed after the VM is created.