Changing the value of a property declared in QML doesn't update it's bindings (Live Preview)

import QtQuick 1.0

Rectangle {
    id: root
    width: 360
    height: 360

    property string t: "Hello World"
    Text {
        text: root.t
        anchors.centerIn: parent
    }
}

sStarting debugger 'QmlEngine' for tool chain 'MinGW'...
dDebugger settings: 
dUseAlternatingRowColours: false  (default: false)
dUseMessageBoxForSignals: true  (default: true)
dAutoQuit: false  (default: false)
dLogTimeStamps: false  (default: false)
dVerboseLog: false  (default: false)
dCloseBuffersOnExit: false  (default: false)
dSwitchModeOnExit: false  (default: false)
dUseDebuggingHelper: true  (default: true)
dUseCustomDebuggingHelperLocation: false  (default: false)
dCustomDebuggingHelperLocation:   (default: )
dUseCodeModel: true  (default: true)
dShowThreadNames: false  (default: false)
dUseToolTips: false  (default: false)
dUseToolTipsInLocalsView: false  (default: false)
dUseToolTipsInBreakpointsView: false  (default: false)
dUseAddressInBreakpointsView: false  (default: false)
dUseAddressInStackView: false  (default: false)
dRegisterForPostMortem: false  (default: false)
dLoadGdbInit: true  (default: true)
dScriptFile:   (default: )
dWatchdogTimeout: 20  (default: 20)
dTargetAsync: false  (default: false)
dMaximalStackDepth: 20  (default: 20)
dShowStandardNamespace: true  (default: true)
dShowQtNamespace: true  (default: true)
dSortStructMembers: true  (default: true)
dAutoDerefPointers: true  (default: true)
dListSourceFiles: false  (default: false)
dSkipKnownFrames: false  (default: false)
dEnableReverseDebugging: false  (default: false)
dAllPluginBreakpoints: true  (default: true)
dSelectedPluginBreakpoints: false  (default: false)
dAdjustBreakpointLocations: true  (default: true)
dNoPluginBreakpoints: false  (default: false)
dSelectedPluginBreakpointsPattern: .*  (default: .*)
dBreakOnThrow: false  (default: false)
dBreakOnCatch: false  (default: false)
dState changed from DebuggerNotReady(0) to EngineSetupRequested(1).
dQUEUE: SETUP ENGINE
dCALL: SETUP ENGINE
dNOTE: ENGINE SETUP OK
dState changed from EngineSetupRequested(1) to EngineSetupOk(3).
dQUEUE: SETUP INFERIOR
dState changed from EngineSetupOk(3) to InferiorSetupRequested(4).
dQUEUE: SETUP INFERIOR
dCALL: SETUP INFERIOR
dNOTE: INFERIOR SETUP OK
dState changed from InferiorSetupRequested(4) to InferiorSetupOk(6).
dState changed from InferiorSetupOk(6) to EngineRunRequested(7).
dQUEUE: RUN ENGINE
dCALL: RUN ENGINE
 Cannot retrieve debugging output!
sQmlJSDebugger: Connect to debug server 127.0.0.1:3768
sQmlJSDebugger: resolving host...
sQmlJSDebugger: connecting to debug server...
sQmlJSDebugger: connected.
s
dJSDebugger sending BREAKPOINTS []
sQML Debugger connected.
dNOTE: ENGINE RUN AND INFERIOR RUN OK
dState changed from EngineRunRequested(7) to InferiorRunOk(11).
sQmlJSDebugger: Connected to debug service 'QDeclarativeObserverMode'.
dQDeclarativeObserverMode  sending SET_DESIGN_MODE false
sQmlJSDebugger: Connected to debug service 'JSDebugger'.
dQDeclarativeObserverMode  receiving SET_DESIGN_MODE false
dQDeclarativeObserverMode  receiving CONTEXT_PATH_UPDATED 
dQDeclarativeObserverMode  receiving CONTEXT_PATH_UPDATED Rectangle
dQDeclarativeObserverMode  sending OBJECT_ID_LIST 2 [list of debug / object ids]
dQDeclarativeObserverMode  sending SET_CURRENT_OBJECTS 1 [list of ids]
dQDeclarativeObserverMode  sending SET_CURRENT_OBJECTS 1 [list of ids]

dQDeclarativeObserverMode  sending CLEAR_COMPONENT_CACHE