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 :)

リンク先の CodePen の再現から始め、特に 72/73 行を確認し、カーソルがチャートの近くに留まっている間に極座標チャートの再描画がいつ OnUnhover をトリガーするのかを追跡してください。完了条件は、再描画中もカスタムツールチップが表示されたままであり、ポインターが該当するチャート要素から実際に離れた場合にのみ OnUnhover が実行されることです。