It doesn't sound like logit calculation breaking. It sounds like the text decoding (ie sampling from the probabilities) that broke. It's also part of the model which they are likely constantly tinkering with. It's easy to imagine how that could result in sometimes coherent sometimes incoherent outputs.
To, me it reads like displaying the wrong clock time to the user. Under the hood, everything is working in UTC, but something went wrong converting that to the user's local timezone. If the whole system works in UTC, actual business logic shouldn't be affected.
If the logit calculation broke, you'd expect complete cascading nonsense like if you set the temperature parameter too high: https://twitter.com/minimaxir/status/1758732017477525792