onEnter and onLeave horizontal is triggered on vertical scroll

Expected Behavior

onEnter and onLeave are triggered when the component enters and leaves the viewport when the parent div is scrolled horizontally, when prop horizontal is given.

Current Behavior

onEnter and onLeave correctly inform if the component is in view, but they are only triggered when the page is scrolled vertically.

Steps to Reproduce

Component

<Waypoint
            horizontal={true}
            onEnter={_handleWaypointEnter}
            onLeave={_handleWaypointLeave}
          />

Handlers

const _handleWaypointEnter = () => {
    setInView(true);
    setChangeCount(changeCount + 1);
  };
  const _handleWaypointLeave = () => {
    setInView(false);
    setChangeCount(changeCount + 1);
  };

React: 17.0.2

react-waypoint: 9.0.3