Custom baby geometry

Hello, I can't get any further and urgently need help.  Unfortunately, my English isn't very good and I'm still learning the scripting language, but I've already had some positive successes.  But here I need help.  I work with notepad++, bridge and blockbench.  I created 3 geometries.  I want e.g. the cow to randomly spawn alternately with these.  The 3rd geo is for the baby because I don't like the standard baby.  I also have multiple textures.  currently 3. These may be random at all.  I have already created 3 component_groups variants for the textures in the BP.  In the controller.render.cow I have array.skins with the 3 textures and array.models with the 3 geo.  Of course the geo and textures are also listed in the entity file.  My coding for this is:

In cow.entity.json by Scripts-initialize:

"variable.random_model = Math.random_integer(0, 1);"

In cow.render_controllers.json

"geometry": "query.is_baby ? geometry.baby : Array.models[variable.random_model]"

"textures": [Array.skins[query.variant]]

But if I start the game for test, my cows are all invisible. I only see walking shadows. What do I wrong? I dried so much. How can I fIx that? Can someone help me?