I have a FeatureLayer with 2 Graphics and rendering them with CIM symbols: '0'

My HitTest function:
view.on("click", (event) => {
view.hitTest(event).then((result) => {
...
}
}
When clicking next to the graphic. hitTest is still returning these graphics sometimes. It looks like the click area is sometimes larger than it should.

The green marker is the position of the mouse click event.

When clicking at the red spot, no graphics in hitResults.
Sometimes it even triggers the wrong graphic.
Thanks