We have the same issue, and it's forcing us to use a script to partition instead of the action. It just won't consistently make the correct choice as it is. I'm not sure what metric they use to determine what to do, but at this point it would be helpful to have an action specific to MBR and UEFI as selectable options to specify what you want it to do. The latest trial was with a Latitude E5450, which has TPM 1.2, in Secure Boot UEFI only as the boot options choice. I thought it was tied to what version of the PXE boot image you got, before, but I know it booted to UEFI on this one, so that wasn't it.
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