help with flickering texture on mob

need help with my textures for mobs, everytime i try to make a texture for a mob and implement it into the game, it just flickers only on the 2d flat parts, is there any fix this that I havent found yet? if it helps to solve the issue, i am used block bench to make the model, texture, and animations, and it is a geckolib entity
 

here is a video for example
https://youtu.be/MECC0dLFNps?si=SnLFS5KZl80myNxa

any help would be greatly appreciated!