Removing SchedulingEngine.AddCountInternal's _state.AdvanceGuideGroup() left both guide-group assertions green: the locked-group test only compared inside/outside the group, and the snapshot only compared item 2 to item 0. Assert the actual sequence instead. Refs #563 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015QqCpYFsKgnAnx6jVwrKiV