From what I read, you found at least one thread here which provided a potential solution for your problem. So yes, at least one person experienced the same problem and mentioned it here in the forum.
They clicked on “Regenerate project files” in Preferences > External Tools or did something else I suggested in their thread. See below.
If what you did solved the problem, it is a solution by definition.
What do you mean by that?
If you hadn’t tried to click on the button yourself, I would have suggested that.
And if that hadn’t fixed the problem, I would have asked you to check if all relevant extensions are installed. See the instruction on the official VS Code website.
If that hadn’t worked either, I would have asked you to check your console in VS Code whether the .NET Framework 4.7.1 is mentioned there. If it was mentioned there, I would have asked you to download the .NET Framework 4.7.1 (Developer Pack) from the official Microsoft website and install it.
Is this what you wanted to know?