I've definitely seen this. One of my least favorite parts of developing with AI is when I add print statements or small changes and the LLM removes them in the process of doing the next thing. I want to work _with_ the AI, not have it stomp all over my code.

Do you think it's actively deciding to remove them or just not noticing you added them and then overwriting?

I ask because when I started informing it I made personal edits, it stopped doing this kind of thing so often and let me work _with_ it more.

My saved prompt now says never to assume a file has not been edited since the last time it was read between prompts.