The finally block at lines 369-371 unconditionally sets the span name and source from `_get_segment_name_and_source()` without checking if a custom name/source was already set by the application (e.g., via `set_transaction_name()`). This contrasts with the `event_processor` method (lines 385-400) which has an `already_set` check that respects custom sources (COMPONENT, ROUTE, CUSTOM). This could cause applications that set custom transaction names to have them overwritten with URL-derived names.