Running the attached sample code will show a text in a QGraphicsView, as in the attached screenshot. Pressing either of the buttons should scale the scene and make the text smaller.

However, when using the function connected with "auto", the scene is not updated after pressing the button. Pressing the "queued" button immediately updates the scene and makes the text smaller.

So it seems that from the auto or direct connected button, the update() of the scene is not correctly handled and the scene is not redrawn.

Internally, the scene is updated, though, as pressing the "auto" button multiple times and then the "queued" button once makes the text a lot smaller. Only the update is not run after updating the scene from the "auto" connected button.