Vulnerabilities are not scanned

I used NVTs to scan for MS12-020 vulnerabilities.
The goal is that Windows XP can scan the results(Microsoft Remote Desktop Protocol Remote Code Execution Vulnerabilities (2671387)), but in the same scan settings (Full and fast) windows 7 (x64/x86) and windows 2008r2 (x64/x86) have no results.
Using the Nessus and Metasploit testing, there are scan vulnerabilities.
What’s the problem?

I guess you are talking about the remote active checks, but correct me if I’m wrong.

Are the RDP ports detected on the false negative hosts (there is a log message from “Microsoft Remote Desktop Protocol Detection” (OID “” on the specific port)?

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Host scan found “Microsoft Remote Desktop Protocol Detection” (OID: “”).