Qt Quick Toolbar working strange on Mac

Steps to reproduce:

• open/create a Qt Quick Application or Qt Quick UI (does not matter if Qt Quick 1 or 2)
• place cursor to an item where Qt Quick Toolbar would be available - wait for the lightbulb
• hit the lightbulb - toolbar appears, you can now modify some settings (but, no need to reproduce this issue)
• click on the toolbar on a space with no widgets in it (no button or similar - just the plain toolbar widget)
• place the cursor on another item (the current won't show up the lightbulb either) - wait for the lightbulb
• hit the lightbulb

Expected behavior:

• Qt Quick Toolbar will appear again

Current behavior:

• Qt Quick Toolbar does not appear again for this Qt Creator run - you have to restart Creator to get the toolbar working again

Note: This does not happen if you click the 'X' button to close the toolbar or if you click outside of the toolbar to close it. In these cases the toolbar will re-appear again and again.