OpenStack Platform 10 Director reverts back the Overcloud nodes from UEFI to Legacy boot mode

Solution Verified - Updated -

Issue

Out-of-the-box install of Red Hat OpenStack Platform 10 sets ironic.conf on the undercloud in default_boot_mode = bios.
As a result introspection of the overcloud nodes works (nodes in UEFI mode) but on deployment the boot mode gets reverted back to Legacy mode, preventing the overcloud nodes from booting.

Environment

Red Hat OpenStack Platform 10

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