Hey, thanks for the report.
This is a known issue with auto-summarization. It can trigger late or incorrectly. The team is aware of it, and there are similar reports here: Composer-1 Unreliably Creates "Context Summary" After Hitting Token Limit
Workaround: try running /summarize manually when you see the context getting close to 70 to 80%. This should help avoid cases where the agent hits the limit in the middle of a task.
Can you share the Request ID from this chat (three dots in the top right > Copy Request ID)? It will help the team understand the specifics of your case.