[vscode-arduino] Basic `wiring` identifiers are undefined?

Bug type: Language Service

Describe the bug

• OS and Version:
  OS: Linux x64 5.16.11-76051611-generic- C/C++ Extension Version:
• VS Code Version:
  Version: 1.65.2
  Commit: c722ca6c7eed3d7987c0d5c3df5c45f6b15e77d1
  Date: 2022-03-10T15:36:26.048Z
  Electron: 13.5.2
  Chromium: 91.0.4472.164
  Node.js: 14.16.0
  V8: 9.1.269.39-electron.0
• Other extensions you installed (and if the issue persists after disabling them):
  • vscode-arduino

Steps to reproduce
As you can see in the screenshot, VSCode claims the most basic wiring APIs are not defined.

I have validated the paths in the c_cpp_preferences.json, and they are correct. I also noticed that the problem matcher claims it is checking against C/C++(20) in the PROBLEMS tab. However, the standard specified in c_cpp_preferences.json clearly states c++14.
For the record: The c_cpp_preferences.json file was generated by the extension. I did NOT modify the file; I only verified its contents.

The code compiles without warnings, and if I press F12, then it will find the definition of either of the API.

Expected behavior
For Intellisense to resolve wiring symbols.

Additional context

I created issue 1468 on vscode-arduino. They were able to reproduce the issue, and asked me to cross post it here. They said they would have done it, but did not have permission to transfer the issue.

Start by reproducing with the listed VS Code, C/C++ extension, Linux, and vscode-arduino versions, then inspect the generated c_cpp_preferences.json and the C/C++(20) diagnostic against its c++14 setting. Compare the unresolved wiring identifiers with the successful F12 definition lookup. Done means IntelliSense resolves the wiring symbols without false undefined diagnostics while compilation remains warning-free.