- Block CONNECTING state in WS guard to prevent second connection seeding knownContainerIdsRef before element_created fires - Call handleCanvasChange() explicitly after element_created updateScene (CaptureUpdateAction.NEVER suppresses onChange in Excalidraw 0.18) - E2E: curved arrow stays deformable after sync round-trip - E2E: auto-title injection test now reliably passes Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>