Tooltip renderMode richText doesn't have dispose

[IndProgo]

Version

4.7.0

Reproduction link

https://codesandbox.io/s/echarts-tooltip-richtext-dispose-2u1y4

Steps to reproduce

Press Dispose chart button

What is expected?

No error

What is actually happening?

Disposing chart which uses renderMode richText for Tooltip will throw TypeError this._tooltipContent.dispose is not a function

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[plainheart]

Yes. It can be confirmed that TooltipRichContent doesn't have dispose method. I'm trying to add it.