I think there is a bug in the chart node. I am sure that doing a Restart Flows under the Deploy dropdown should clear the chart and any ui_update settings, just like a node red restart, but it doesn't. I will have to check other node types to see how they behave to see if it is a generic issue or chart node related.
[Edit] I have asked a question about what Restart Flows should do in a new post.
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