A GPT-partitioned disk will have a "protective MBR": a MBR-compatible first block that basically says: "this disk is completely used by a strange partition type that is not bootable using legacy-style methods". If the system is now configured to attempt legacy-style booting, it would try to find a legacy-style boot code (Master Boot Record, or MBR for short) in the first block of the hard disk. That is, it has a GPT partition table and an ESP boot partition. The F12 boot option screen seems to indicate that the disk is currently configured as UEFI-bootable.
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