Loss of model smoothing when adding/changing textures

There is one problem with texturing in the game, and more specifically with the loss of anti-aliasing.
When we add a texture (even vanilla) in the gamedata folder, then in the game this model sharply loses anti-aliasing and the texture ripples very much from afar.
More specifically, I added edits to textures from the vanilla game (military armor in the attic and heavy armor of freedom).

Screenshots: