I modified infantry and vehicle units to stay after death in Kane's Wrath, using WrathEd.

All I changed was SinkDelay and DestructionDelay
While it seems to work in-game, somehow all of the units have no voices (when you click on them or issue them some orders, they don't tell anything)

I'm going to describe exactly what I did, just to be sure.
For example, the NOD militant unit.
I made a NODMilitant.xml file, where I copied everything from the original one, from

<?xml version="1.0" encoding="utf-8"?>
<AssetDeclaration xmlns="uri:ea.com:eala:asset">

to

</GameObject>
</AssetDeclaration>

and the only 2 things I edited are the SinkDelay and DestructionDelay parametres.

So, can anyone help me here? What is wrong? Why all of the edited units have no voices?