Switching threads for debugging with Qt5/clang/lldb broken after used

Steps to reproduce:

• set up kit using Qt5, clang, lldb engine
• create simple Qt Gui App (template from wizard)
• start debugging
• when inferior comes up, hit interrupt
• check there are some threads inside the respective QComboBox
• switch to some of the listed threads (works fine)
• continue debugging
• interrupt again
• try to switch the threads now

Expected result:

• switching threads works as after first interrupt

Current result:

• you switch to some thread that is before the selected inside the combo box (