Waypoints sometimes show an inverted vertical direction

The bug

When an entity is above or below the player and the player can see its waypoint, the arrow shows the direction from the entity rather than to the entity. It should instead point towards the entity.

The attached screenshots were taken at the same position.

Steps to reproduce

1. Add a waypoint to the nearest non-player mob:

   attribute @n[type=!minecraft:player] minecraft:waypoint_transmit_range base set 999

2. Stop the mob from moving by dropping it into a hole, surrounding it, or freezing its ticks:

   tick freeze

3. Move above the entity, but make sure you can still see its waypoint on the locator bar.

4. Look straight up. Alternatively, go below the entity and look down — the result will be the same.