When the Chat context is summarized, at least in Claude Opus 4.5, at the time the context windows becomes full, the message “Planning next steps” or something appears and it goes on for a very long time without moving forward and doing anything. It happened twice in a long thread. I gave up waiting both times. I stopped it and then resumed with the message “Please continue” and it proceeded quickly. So, I think there is a jam there.
Reporting a bug that way wouldn’t work for me. It wouldn’t post.