Using Disk Utility on High Sierra (macOS 10.13.6) I've got the following: 2 unwanted partitions both formatted as 'Free Space'

The UI appears to allow each of them to be selected and the '-' button remains active. Note the text shown also specifically states that they can be deleted. However when 'Apply' is performed the following failure occurs:

Operation Failed

Short of reformatting the entire 1TB drive what can I do to rectify this?

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