[Bug] 当使用svg渲染，折线图使用渐变色时，series中data数据都相同时折现无法显示

[renqiankun]

Version

5.5.1

Link to Minimal Reproduction

https://codepen.io/renqiankun/pen/zYVYzXN

Steps to Reproduce

1当使用svg渲染，2折线图使用渐变色时，3 series中data数据都相同

Current Behavior

折现图无法显示

Expected Behavior

同canvas渲染可以展示折现

Environment

- OS:
- Browser:
- Framework:

Any additional comments?

No response

[echarts-bot]

@renqiankun It seems you are not using English, I've helped translate the content automatically. To make your issue understood by more people and get helped, we'd like to suggest using English next time. 🤗

TRANSLATED

TITLE

[Bug] When using SVG rendering and line chart using gradient color, the data data in the series cannot be displayed when the data data are the same

BODY

Version

5.5.1

Link to Minimal Reproduction

https://codepen.io/renqiankun/pen/zYVYzXN

Steps to Reproduce

1. When svg is used for rendering and 2. when the line chart uses gradient color, the data data in 3 series are the same.

Current Behavior

Discount chart cannot be displayed

Expected Behavior

Discounts can be displayed with canvas rendering

Environment

- OS:
-Browser:
- Framework:

Any additional comments?

No response

[renqiankun]

Expect SVG to also display

[plainheart]

Duplicate of #15467, #19726

[plainheart]

之前已经研究过这个问题，后面我会再跟进下。