I tried as you suggested but it didn't work. If you want I list the tree of nodes that I have in the scene so you get a better idea: platform(staticbody2d) that has as children = spawnposition(position2d), sprite, collisionshape(collisionshape2d), dangerarea(area2d) that has as children = collisionshape(collisionshape2d), then always as children of platform I have = timer. Then I have the bullet scene which is separate from this scene(platform) of course.
Anyway as you wrote the example above I did: $spawnposition.globalposition = missile.globalposition(I instantiated the missile in the variable "missile"). I don't know... if that's not correct, please correct me.