I'm not referring to creating game attributes, but to creating normal attributes (inside behaviors and events) of "game attribute" type. I attach a screenshot (1) to show what I'm talking about. As you can see, in the drop-down list there is no "game attribute" type, whereas in Stencyl 2 it was present (even if the interface was different). On the right panel, where all the attributes of the behavior are listed, you can see that some of them are of "game attribute" type, but they where just inherited from Stencyl 2. In "screenshot(2)" I took a screenshot of the equivalent attribute creation panel in Stencyl 2, where you can see that the "game attribute" type is present.