Zoom not triggering plotly_relayout in scattermapbox

[charleyferrari]

It looks like the plotly_relayout event only gets triggered upon panning, but not zooming. If you do zoom, and then pan however, the new zoom level will be echoed.

Expected behavior: plotly_relayout should be triggered upon zoom and pan.

Check out the codepen for an example:

https://codepen.io/charleyferrari/pen/yEJmYv