I found the solution in a badlogic forum.

modelInstance.materials.get(0).set(FloatAttribute.createAlphaTest(0.95f));

I found the solution in a badlogic forum.

This:

modelBuilder.part("minecraft:loading_model", mesh, 4, new Material(TextureAttribute.createDiffuse(atlas), blendingAttribute, FloatAttribute.createAlphaTest(0.95f)));

Or this:

modelInstance.materials.get(0).set(FloatAttribute.createAlphaTest(0.95f));