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Setting <split_impulse_penetration_threshold> tag of bullet Engine in .world file does not work

Here's the code of the .world file. Whatever I change -0.05 to be, both + and -, the gap between objects in gazebo is always the same and seems -0.01, the default value. But when I add <erf> etc. in <constraints> tag, things do happen. So it confirms gazebo is reading this file. But I cannot figure out why the value of split_impulse_penetration_threshold is ignored.

<sdf version="1.6"> <world name="default">

<!-- A global light source -->

<!-- A ground plane -->
<physics type="bullet">


            <contact_surface_layer> 0 </contact_surface_layer>
            <split_impulse> 1 </split_impulse>
            <split_impulse_penetration_threshold> -0.05 </split_impulse_penetration_threshold>

</world> </sdf>

enter code here