Windows 10: Microsoft Defender custom scan results show incorrect time and number of files scanned

Edition: Windows 10 Home
Version: 2004
OS build: 19041.508​

When I use Microsoft Defender to scan a file, the results show incorrect time and number of files scanned.​

I tested this on a single plain text file and a new folder containing a single plain text file.​

I tried 2 methods:
1 right-click on a file, then "Scan with Microsoft Defender ..."
2 Windows Security
-> Virus & threat protection
-> Scan options
-> Custom scan
-> Scan now
-> Select folder ​

The results are like this​

1 No current threats​

2 Last scan: <yesterday or many hours ago>​

3 0 threats found​

4 Scan lasted x minutes y seconds​

5 <tens_of_thousands> files scanned
Lines 2, 4, 5 are obviously wrong.​

Can this be fixed so I have some assurance Microsoft Defender is actually scanning the selected files?​

:)

 

Windows 10 Defender scanning downloaded files

Running Win10 Home 64bit on a MSI Z270-A PRO motherboard, i7-6700, 16 GB ram.
This is a new build for me and I just installed Win10 Home and did all updates.

When I download programs with Defender running, do I have to manually scan the file before installing the program?

When I tried to manually scan a downloaded program using the following method, it doesn't show results of the scan:

• Rt click the file name.
• In the pop up menu, click "Scan with Windows Defender"
• A window pops up showing "Full Scan", "Custom Scan" and "Windows defender offline scan", but no results of the individual file scan.

Thanks for any ideas.

 

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I have Defender Windows 10. I tried using custom scan to select and scan external drives. The screen listing the drives comes up, but the "OK" button remains grayed out so unable to scan any of the drives listed. Any suggestions would be appreciated.

 

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Ran twice & number of files were very diferent
with almost 100% more files !

It would be nice if MS Defender would show the equivalente same number of files scanned on quick scan on the same consecutive hour in situations where no new number of files were ever created or added to the computer running Windows 8.1.?