This DEV-only field was added in 836331ba5f69f2cc53b273ec073fae116db14302 by @sebmarkbage but it's not being used anymore to my knowledge.
);
        break;
      }
      case 'backwards': {
        
        
        
        
        let tail = null;
        let row = workInProgress.child;
        workInProgress.child = null;
        while (row !== null) {
          const currentRow = row.alternate;
          
          if (currentRow !== null && findFirstSuspended(currentRow) === null) {
            
            workInProgress.child = row;
            break;
          }
          const nextRow = row.sibling;
          row.sibling = tail;
          tail = row;
          row = nextRow;
        }
        
        initSuspenseListRenderState(
          workInProgress,
          true, 
          tail,
          null,