isosky opened a new issue, #18719:
URL: https://github.com/apache/echarts/issues/18719

   ### Version
   
   5.4.2
   
   ### Link to Minimal Reproduction
   
   series: [         {           type: 'lines',           coordinateSystem: 
'bmap',           polyline: true,           data: [{             
coords:[[116.46, 39.92],[115.46, 39.92]]}           ],           silent: true,  
         lineStyle: {             color: 'rgb(200, 35, 45)',             
opacity: 1,             width: 10,             curveness:0.5           },       
    progressiveThreshold: 500,           progressive: 200         }       ]
   
   ### Steps to Reproduce
   
   在官方的示例上修改了下data的coords,修改成2个点,增加了curveness,但是还是绘制了直线。      
   
   
   
![Snipaste_2023-06-07_10-48-11](https://github.com/apache/echarts/assets/15280424/6bf0e18c-5a2b-4bc4-8186-c2cb9cf1df67)
   
   
   ### Current Behavior
   
   目前是一条直线
   
   ### Expected Behavior
   
   需要绘制曲线
   
   ### Environment
   
   ```markdown
   - OS:
   - Browser:
   - Framework:
   ```
   
   
   ### Any additional comments?
   
   _No response_


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