When adding a New File, type C++ Class, with a project already active, and selecting the dialog option to add to the current project, it is not automatically added. Instead, a popup gives the option to copy the files to the clipboard to be added manually (via CMakeLists).

I did not have this issue in the prior version of Qt Creator; there, files were automatically added to the project.

I would expect that either the new source files would automatically be added to CMakeLists (which would be preferred), or that there was no dialog option suggesting that it would automatically be added to the current project.