Pen tool : make anchor points visible after layer selection ?

Hello,

Let me explain the process : first I draw something with the curvature pen tool, then I draw something else on a different layer, and whenever I get back to my first layer (on which I've used the curvature pen tool) the anchor points are not visible. In order to make them visible, I have to add a dummy new point on the shape then the other anchor points become visible.

Here's what happen when I click on the layer (grey object), we can see the shape but not the points :

So, please someone could tell me how to make the anchor points visible when I select a layer, in order to modify them ?