Switching models mid-chat can lead to unexpected results, as the new model may misinterpret the conversation context or file state from the previous model.
To help us investigate: Could you share which model you were using before switching to Opus 4.5 Thinking?
By the way, this also repeats the behavior in which returning to the checkpoint does not return erased files. You need to either Undo in the editor or undo the changes via git.,
