twin720 opened a new issue, #20273:
URL: https://github.com/apache/echarts/issues/20273

   ### Version
   
   5.5.1
   
   ### Link to Minimal Reproduction
   
   
https://echarts.apache.org/examples/en/editor.html?renderer=svg&code=PYBwLglsB2AEC8sDeBYAULTsBEAPAgrhAM7YBcy6W1OYAniAKbk4DGAhmIwObABOdbABoqWAL4iMWbHUIkWqKTVoNmFbADd2AGwCuzSdQmjM2Yoz4RGpCgG0TNRcuUATTuzsPnWWwHJ82iAAFuy-QrAATAC6ht40fgHBoeEADDFecQmBIWGw0Lra2ulKcZhZSblpsaVl_tnJsACMxTU-dRWpLa2wfgBCfOwawLnN1TV-AMIhfNpWufmFXa1-ACKM2mANjWkZyktx2PRMLNiz0Aa7NGYAtsDAYEEsYHz6Y97YrDDnrGAAcgXaGywZ6vS5iBzFMQAbiAA
   
   ### Steps to Reproduce
   
   1. Open link example or open Offical Editor and type code:
   ```
   option = {
       "xAxis": {
           "type": "category",
       },
       "yAxis": {
   
![echarts-example](https://github.com/user-attachments/assets/7308d754-d64e-4b67-a4c0-df3ab62a70d6)
   
           "type": "value",
       },
       "series": [
           {
               data: [
                 ['Alpha', 2],
                 ['Alpha', 0],
                 ['Alpha', null],
                 ['Alpha', 0],
                 ['Alpha', 1],
                 ['Alpha', 0],
                 ['Bravo', 1],
                 ['Charlie', null],
                 ['Delta', 10]
               ],
               "type": "line",
               "smooth": true,
               "connectNulls": true,
           }
       ],
   };
   ```
   3. Make sure the graph line is not displayed.
   
![echarts-example](https://github.com/user-attachments/assets/eedf653c-f72c-42de-95fa-097c0d8361c9)
   
   
   ### Current Behavior
   
   the graph line is NOT displayed for SVG rendering mode
   
![echarts-example](https://github.com/user-attachments/assets/6cf7a490-43a2-467e-a66b-130839526ef4)
   
   
   ### Expected Behavior
   
   the graph line is displayed for SVG rendering mode
   
![echarts-example2](https://github.com/user-attachments/assets/f2f701e7-e5e2-49f4-a51e-a02c256bff4f)
   
   
   
   ### Environment
   
   ```markdown
   - OS: Windows 10 Pro 22H2 19045.2486
   - Browser:
   Chrome 127.0.6533.120 (64 bit)
   Firefox 129.0.1 (64 bit)
   - Framework: -
   ```
   
   
   ### Any additional comments?
   
   Please note that the error is reproduced only for SVG rendering mode! For 
CANVAS rendering mode the line on the graph is displayed normally.


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