"There are 12 objects left in the plugin manager pool." after opening QML Profiler

1. Start Creator from the command line.
2. Go to Debug mode and open the QML Profiler.
3. Quit Creator.
   On the command line, you can read:

   There are 12 objects left in the plugin manager pool.
   The following objects left in the plugin manager pool: (Core::FindToolBarPlaceHolder(0x2141bd0), Core::FindToolBarPlaceHolder(0x214ae90), Core::FindToolBarPlaceHolder(0x2151380), Core::FindToolBarPlaceHolder(0x2157fb0), Core::FindToolBarPlaceHolder(0x215f060), Core::FindToolBarPlaceHolder(0x21667c0), Core::FindToolBarPlaceHolder(0x216d120), Core::FindToolBarPlaceHolder(0x2174200), Core::FindToolBarPlaceHolder(0x217b270), Core::FindToolBarPlaceHolder(0x21823a0), Core::FindToolBarPlaceHolder(0x2189590), Core::FindToolBarPlaceHolder(0x2193100))
   

Creator should not cause warnings in such a simple situation.