qmake CONFIG arguments not used when targeting symbian

When i try use CONFIG(release, debug|release) in my .pro files and try to add 'release' to CONFIG using qmake command line arguments it says that i'm using debug config for both debug and release builds, 'release' is not added to CONFIG.
Actually i tried with some random strings like 'sdfjhsakfdh' and they were not added either

On the other hand when i write CONFIG+=release in body of pro file it works fine
Also on S60 Simulator works fine

.pro file (default console app project):
#-------------------------------------------------
#

1. Project created by QtCreator 2010-10-26T10:45:54
   #
   #-------------------------------------------------

QT += core

QT -= gui

TARGET = DebugReleaseBug
CONFIG += console
CONFIG -= app_bundle

TEMPLATE = app

message($$CONFIG)

CONFIG(release, debug|release):message(Release build!)
CONFIG(debug, debug|release):message(Debug build!)

SOURCES += main.cpp
#-------------------------------------------------

Steps to reproduce:
Run qmake from Qt Creator or run below qmake commands from command line (i used NokiaQtSdk with Qt Creator 2.0.0 - all updates drom Updater applied)

Using automatically added Debug configuration:

• automatically set qmake command: qmake.exe C:/Projects/Qt/Tests/DebugReleaseBug/DebugReleaseBug.pro -r -spec symbian-abld -after OBJECTS_DIR=obj MOC_DIR=moc UI_DIR=ui RCC_DIR=rcc
• console output:
  Uruchamianie: "c:/qt/nokiaqtsdk/symbian/sdk/bin/qmake.exe" C:/Projects/Qt/Tests/DebugReleaseBug/DebugReleaseBug.pro -r -spec symbian-abld -after OBJECTS_DIR=obj MOC_DIR=moc UI_DIR=ui RCC_DIR=rcc
  Project MESSAGE: lex yacc warn_on debug uic resources stl_off qt warn_on release incremental debug shared stl exceptions rtti incredibuild_xge def_files console
  Project MESSAGE: Debug build!

Using automatically added Release configuration:

• automatically set qmake command: qmake.exe C:/Projects/Qt/Tests/DebugReleaseBug/DebugReleaseBug.pro -r -spec symbian-abld -after OBJECTS_DIR=obj MOC_DIR=moc UI_DIR=ui RCC_DIR=rcc CONFIG+=release
• console output:
  Uruchamianie: "c:/qt/nokiaqtsdk/symbian/sdk/bin/qmake.exe" C:/Projects/Qt/Tests/DebugReleaseBug/DebugReleaseBug.pro -r -spec symbian-abld -after OBJECTS_DIR=obj MOC_DIR=moc UI_DIR=ui RCC_DIR=rcc CONFIG+=release
  Project MESSAGE: lex yacc warn_on debug uic resources stl_off qt warn_on release incremental debug shared stl exceptions rtti incredibuild_xge def_files console
  Project MESSAGE: Debug build!