[I] [Bug] Hover on legend item for custom series with array focus highlights first item in other series [echarts]

[via GitHub]

jonrimmer opened a new issue, #20926:
URL: https://github.com/apache/echarts/issues/20926

   ### Version
   
   5.6.0
   
   ### Link to Minimal Reproduction
   
   
https://echarts.apache.org/examples/en/editor.html?code=MYewdgzgLgBAJgQygmBeGBBATlhBPAOgDMsQBbACgG8AbAUzAHMoALALhgCYAGAXwEoCZBAAcKFAPoAaGAEt-aAHwxqAKBgwAHh1lT1MBDpgBqGAEY9GgEYceMALSzVA_gG5VqogFcwwKLPAYLAY4OiwASSg6ShEEXDIIGVF5GCp9UEhYTQA3NAMRWQJshBovOgpY-IgCBlBQgk0AbW4AXX508GgYPFz0ZKKSsoq4hASa3xB6vGa29w0MrsbNKTwWvP7QECw4CiXsmR7Zjw1gqC8sMFT9DSg8EToOAHJgWSxgekfLDS0vjTxfmBEEDALwQDiNSqjaqIZDhMChTQtAEQFiiB5Xb7fLAcAAc1xgvGRt3oHDSmI0RFkNBoHH62VkEC8JQozxANC2j3amN4-h5PNUIBE_kC6DJ8CQCAgdCgpPxEBA52A6JhCC-hP0mgwmgZssxt3uT2KpToj15XzwWp1qXVGnojBCuu-KvBjwwnxgjwAQo8Wmb9FKsLI6GCYI18WLMWBRujXZ98RpapN0RHydoPZo4-TvngnghTVmbeT9TGQdByJnycF4WFItEAfM2VsnlZjfnvoWNCmNFGyDHvfWYInQo6s2nHhmB39m23uQPi09S1BywOq6EIlEyAPQOzsR7gnAZwT9EjnK4gA
   
   ### Steps to Reproduce
   
   Create a chart with two custom series. There series can return any shape, 
but they must use `focus` to return an array containing the current 
`params.dataIndex`. This allows hovering on any item to focus on all items with 
that data index in all defined series.
   
   
   ```tsx
   function renderItem(params, api) {
     const xv = api.value(params.encode.x[0])
     const yv = api.value(params.encode.y[0]);
     const [x,y] = api.coord([xv, yv]);
   
     return {
       type: 'circle',
       x,
       y,
       focus: [params.dataIndex],
       shape: {
         r: 8
       },
       style: {
         fill: api.visual('color')
       }
     }
   }
   
   chart.setOption({
     // ...
     series: [
       {
         name: 'A',
         encode: {
           x: 'x',
           y: 'a'
         },
         type: 'custom',
         renderItem,
         color: 'blue'
       },
       {
         name: 'B',
         encode: {
           x: 'x',
           y: 'b'
         },
         type: 'custom',
         renderItem,
         color: 'red'
       }
     ],
   });
   ```
   
   
    
   
   ### Current Behavior
   
   As desired, hovering over items in the series correctly highlights all the 
items at that data index:
   
   
https://github.com/user-attachments/assets/cd520a92-d989-4eaf-ac9c-eff51b0bd6fc
   
   However, when you now hover over a series' item in the legend, the first 
item of the other series is incorrectly focussed as well as the series itself:
   
   
https://github.com/user-attachments/assets/15df03d8-48cb-4aa3-8e79-256b02cfeed7
   
   ### Expected Behavior
   
   When hovering the legend item, only the items belonging to that series 
should be focussed.
   
   ### Environment
   
   ```markdown
   - OS: macOS
   - Browser: Chrome 135.0.7049.85
   - Framework: N/A
   ```
   
   ### Any additional comments?
   
   _No response_


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