Class is added to wrong project file

Create two "Qt Console Application" projects named e.g. app1 and app2.
Right-click app1 and select "Add New..." from the context menu.
Select "C++ Class".
Enter a class name on the second page.
On the third page, "Add to project" is by default set to app1.pro. Click on this dropdown list, hover the mouse over app2.pro so it is highlighted and then click outside the list so that app1.pro stays selected.
Click Finish.

The source files for the new class have now been saved in the app1 directory as expected.
The source files for the new class are not referenced by app1.pro as expected, but by app2.pro:

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QT += core
QT -= gui

TARGET = app2
CONFIG += console
CONFIG -= app_bundle

TEMPLATE = app

SOURCES += main.cpp \
../app1/classa.cpp

HEADERS += \
../app1/classa.h
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