Blender UI paper cuts

When I’m using a tool into an area (n°1, ex Annotate in Uv editor) I can see the left toolbar in the same area showing the correct tool (n° 2).
In the 3d view another tool is selected and properly displayed in the left toolbar (n°3 ex Grab tool, not Move as the popup… ).

But the upper toolbar (n°4) is not reflecting my current mouse position and tool:
the toolbar should update as I change the mouse from area to area, showing the effective tool I’m using.