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Hello. Not 100% sure if we experienced the same issue, but maybe this is helpful for you:
Starting this October we had a few clients not able to resolve internal hostnames and home printers. Like "ping wsus01" was "not resolveable". But "ping -4 wsus01" was successful. After a lot of investigation we figured out, that a GPO was causing the issue. This is the reg-key which we deleted now: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\DNSClient\ - DisableSmartNameResolution
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