Issues with BIOS Boot after Updating RHEL 8.10

I recently updated around 100 systems running RHEL 8.10 using Ansible with dnf. The majority are UEFI-based and upgraded fine, but I encountered problems with two virtual machines that operate in legacy BIOS mode. After the update, both failed to boot.

Here's a bit of context:
- These are virtual machines with no changes at the VM level (like firmware, boot order, or disk configuration).
- There were no manual changes to grub or the bootloader other than those applied in the update.

After rebooting, I faced these symptoms:
- The VM couldn't boot from the disk anymore.
- It immediately tried to PXE boot instead.
- The disk remains in the BIOS boot order, but no valid boot target is found.
- It appears the bootloader or MBR may have been wiped or become unusable.

These were standard RHEL installs, without any unusual partitioning or dual-boot scenarios.

I know legacy BIOS is becoming less common, but these systems were stable before the update. I'm aiming to see if others have faced similar issues or if there's any Red Hat knowledge base references. Also, I'm trying to determine if this is a known problem or just a rare edge case. I managed to recover critical data by mounting the VMDK to another VM, and services are back up and running on a new UEFI VM. I'm planning to try a recovery disk next week to figure out the root cause.