Not possible to use some QtWebEngine private headers

Steps to reproduce:

1. Add QtWebEgine private modules to the project (WebEnginePrivate, WebEngineCorePrivate) built with Qt distribution from the installer
2. Add include <private/qquickwebengineview_p_p.h>
3. Try to build project in debug mode

Expected result

• Project builds

Observed result

• Compilation fails with error about missing include:
  [snip]\include\QtWebEngine\5.14.0\QtWebEngine\private\qquickwebengineview_p_p.h:55: error: C1083: Cannot open include file: 'render_view_context_menu_qt.h': No such file or directory

Note:

Maybe some tool doesn't copy the header because it doesn't follow the _p.h naming scheme?

Sample project attached.