Ask HN: Degraded GPT-5.5 Quality?

For the last two days, GPT-5.5 (high) just seems to ignore requests. I had a simple task which came down to

"There's a navigation in the UI that goes A -> B -> C. I would like to put the information of B into C, and make the navigation A -> C".

It failed three times, after compacting it still had trouble doing something this simple. I ended up doing it myself