Windows Defender, "Items Skipped During Scan"

I keep getting this notification after quick scans, "Windows Defender skipped an item due to exclusions or network protection settings."

To make this clear: I don't have ANY exclusions, and as far as I'm aware, I haven't changed my network protection settings in the past.

What's going on? Is this malware, or a bug with the new update? How do I fix this? I want to be reassured that I'm safe, this isn't very reassuring.

EDIT: Thank you to Techradar for bringing this issue to light. If any employees read this, could you perhaps re-title it in a way which doesn't make users feel so endangered by the bug? All of us have come to the conlusion that (especially with MBAM) we should be clear.

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