Why is my Windows Defender only scanning four files?

Starting this afternoon, inexplicably, whether I use "quick scan" or "full scan", Windows Defender will only scan 4 files, and the scanning process only lasts for a few seconds.

May I ask how is this going? How to solve?
 

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Last updated October 14, 2019 Views 1,441 Applies to:
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Doing a custom scan should still work.... 

Here's a German article. You could use Translate or another translator to  read it...

>https://www.deskmodder.de/blog/2019/09/18/windows-defender-aktuell-mit-einem-scan-problem-durch-die-antimalware-version-4-18-1908-7/

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Anyway, the issue is partly fixed with Antivirus definition version 1.301.1684.0 - details are added to my blog post Scan issues with MSD/Defender Antimalware version 4.18.1908.7
Blogs: http://www.borncity.com/blog /(Ger) - and - http://borncity.com/win/ (EN)

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