This DEV-only field was added in 836331ba5f69f2cc53b273ec073fae116db14302 by @sebmarkbage but it's not being used anymore to my knowledge.
if (state.dehydrated !== null) {
                pushSuspenseContext(
                  workInProgress,
                  setDefaultShallowSuspenseContext(suspenseStackCursor.current),
                );
                
                
                
                workInProgress.flags |= DidCapture;
                
                
                return null;
              }
            }
            
            
            
            
            const primaryChildFragment: Fiber = (workInProgress.child: any);
            const primaryChildLanes = primaryChildFragment.childLanes;
            if (includesSomeLane(renderLanes, primaryChildLanes)) {
              
              
              return updateSuspenseComponent(
                current,
                workInProgress,
                renderLanes,