This is a known issue that our engineering team is actively investigating. BugBot runs can occasionally get stuck and fail to complete within the expected timeframe, particularly when tool calls within the review process timeout.
Workaround: As @Jacob3 (two Jacobs on the same thread 0.0) mentioned, commenting @cursor review on the PR will spin up a fresh BugBot run, which should complete normally. This is currently the best way to unblock a stuck review.