driver-core/src/main/com/mongodb/internal/connection/ConcurrentLinkedDeque.java
private Node<E> nextNonmarker() {
            Node<E> f = getNext();
            return (f == null || !f.isMarker()) ? f : f.getNext();
        }
private Node<E> nextNonmarker() {
            Node<E> f = getNext();
            return (f == null || !f.isMarker()) ? f : f.getNext();
        }
Returns next node, ignoring deletion marker.