Stack area not working properly below zero on Y axis.

[makso94]

Version

5.0.2

Reproduction link

https://pastebin.com/4bXHQH0f

Steps to reproduce

Paste the pastebin code here:
https://echarts.apache.org/examples/en/editor.html?c=confidence-band

What is expected?

The gray area should be + - 2 around the temperature curve.

What is actually happening?

The bands don't follow when the curve goes below 0 by Y axis. The lowest they go is 0.

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