Plugin ClangCodeModel reports false errors after an "out-of-the-box" installation

Approach:

• Install Ubuntu 20.04.2 LTS.
• Immediately after that install qtcreator: "sudo apt install gcc g++ make qtcreator qt5-default"
• Start qtCreator, create a plain C++ application

Problem:

ClangCodeModel reports wrong errors / is not working properly. See screenshot 01.

Workaround:

My current solution: Deactivate the ClangCodeModel plugin (screenshot 02).