OnUnhover being called when it shouldn't

I'm not happy with the builtin tooltip for the polar chart, so I'm attempting to make my own, however I'm having issues with it hiding as soon as it should show, and form what I can tell this is because it's running OnUnhover on every redraw (while the cursor is anywhere near the chart)

I've attempted to set up a simple example here
https://codepen.io/tim-logan/pen/qBqOeMZ?editors=1010

Line 72/73 can be flipped in/out with comments to see the result either in console or directly on the plot.

I may just be doing something wrong, but it looks like a bug to me :)

Commencez par la reproduction liée dans CodePen, en particulier les lignes 72/73, et déterminez quand le redessin du graphique polaire déclenche OnUnhover alors que le curseur reste près du graphique. Le travail est terminé lorsque l’infobulle personnalisée reste visible pendant les redessins et que OnUnhover ne s’exécute que lorsque le pointeur quitte réellement l’élément de graphique concerné.