Nano Banana keeps ignoring my instructions not to alter parts of a picture?

Trying to figure out what I need to do here. I use AI to generate images for my TTRPG game. I'll take an image of a character and say 'replace the uniform with armor' or something and it will give me a pic of a completely different person. Even if I specify not to change the face. I feel like I've seen people who have done this successfully. Any hints?

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