The original code only set telemetry['span_id'] when telemetry.get('span_id') is None. In the new structure, the else branch runs whenever the if-condition fails for any reason — including the case where telemetry['span_id'] is already populated by the caller. In that else branch, if an external propagation context exists, it unconditionally overwrites the already-set telemetry['span_id']. This is a behavioral regression: any caller that pre-populated span_id on the telemetry payload (e.g. logs/metrics constructed with an explicit span_id) will have it silently replaced when external (e.g. OTel) propagation is registered, leading to incorrect span_id values reported to Sentry.