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 :)

Comece pela reprodução vinculada no CodePen, especialmente pelas linhas 72/73, e rastreie quando o redesenho do gráfico polar aciona OnUnhover enquanto o cursor permanece próximo ao gráfico. A tarefa estará concluída quando o tooltip personalizado permanecer visível durante os redesenhos e OnUnhover for executado somente quando o ponteiro realmente sair do elemento de gráfico relevante.