Tween can't get property path correctly, even when it is copied from AnimationPlayer

+1 vote 
 var inst = preload("res://class/someareablast.tscn").instance()
 var vis = preload("res://Effects/spells/NukeP.tscn").instance()
        var twin = Tween.new()
        vis.add_child(twin)

        inst.add_child(vis)
        add_child(inst)
        twin.interpolate_property(vis,"Particles:process_material:shader_param/emission_sphere_radius",0.0,visvol,2.0*spell.lvl)
        inst.global_transform.origin = where
        twin.start()

Throws silent error - tween target node has no property called "Particles:processmaterial:shaderparam/emissionsphereradius"

Just to make sure this path is correct I created AnimationPlayer inside Nuke scene, added keyframe with editor option, and copypasted resulting string path into code above. Tried to change places of some lines, couldn't get anything to work. How is this path wrong ??

Godot version godot 3.2 stable
in Engine by (7,925 points)

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