"Synchronize" button is not updated on Mac with Qt5

Scenario to reproduce:

1. Open any file with a 3D structure.
2. Click "Add" button on the local toolbar of the 3D view.
3. Add some 3D structure to the view.
   Expected state: there are two 3D structures in the 3D view, the "synchronize" button is unchecked.
4. Click the "synchronize" button.
   Expected state: views are synchronized, the button is checked.
   Current state: views are synchronized, the button is unchecked. After switching to another application the button updates its visual state.