Following these updates there are users who claim that Windows Defender overrides some files during a quick or full scan, as if there were exceptions on their devices. Note that these users did not add file exceptions but Windows Defender simply bypasses the scanning of files without being asked.
Users experiencing this behavior also receive an error message in Action Center stating:
"Items were not scanned during the scan. His scan Windows Defender Antivirus overrides an item due to network exclusion or scan settings. ”
At first glance, this problem seems to exist in the version of AntiMalware after the updates released by Microsoft. However, it appears that there are files that are skipped during the scans, regardless of the version of the Antimalware Client, which may mean that the error is not necessarily present in Windows Defender.
You may be able to see this behavior on a Windows 10 1909 device. Update virus definitions to the latest version of the Antimalware Client. You will see that although there are no exceptions on your computer the message will appear in the Action Center after a quick scan.
OR Microsoft has not recognized the problem, so it is not yet clear if this is an individual problem or if it affects a significant number of devices.
The next patch Tuesday will be held on April 14, to see if we have news by then.