Hi,
This kind of issues is now reported thanks to a new feature that is available on SonarCloud. SonarCloud automatically imports issues generated by the third-party Roslyn analyzers that are configured on your solutions.
This makes you see, in SonarCloud, the same issues you have locally in Visual Studio.
You can deactivate this behavior for your projects: Administration > General Settings > External analyzers > C# Ignore issues from external Roslyn analyzers.
Out of curiosity, why don’t you want to see those kind of issues in SonarCloud?