If QT_ANDROID_PACKAGE_SOURCE_DIR is set to a specific path, a build folder is recursively created within the build folder.

Use QtCreator 13.01, Qt6.5.3
Steps to reproduce:
・Projects > Build Android APK > Detailes > Create Templates
・Change the path of Android Package source directory to "ProjectPath/android" > "ProjectPath" and click
・Add the following to CMakeLists.txt
set_property(TARGET apptest APPEND PROPERTY
    QT_ANDROID_PACKAGE_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/
)
・Build
build folder is recursively created within the build folder.