Not trying to excuse google but wonder why that happens. I have had my own issues with ChatGPT memory but that's more like it forgets the context and spits out something gibberish at a later invocation counter to what it said earlier in the thread. But that's because it is buggy.

Rewriting history requires computes which is more malicious. Why would someone burn compute to rewrite your stuff given that rewrites are not free? Once again not defending google trying to think through what's going on.