Looks like we can't reproduce the issue or there's a problem in the test case provided.
Garbage collection when chart is destroyed that has "tips"
When a chart is destroyed that has "tips" the tips doesn't seem to be removed when the chart is destroyed.
Same applies to the super annoying bug when closing a tab, the "x" isn't removed.
Thanks / E
Thanks for the report! I have opened a bug in our bug tracker.