[I] [Bug] SVG map series legend doesn't show [echarts]

[via GitHub]

krackramadub opened a new issue, #21092:
URL: https://github.com/apache/echarts/issues/21092

   ### Version
   
   5.6.0
   
   ### Link to Minimal Reproduction
   
   
https://echarts.apache.org/examples/en/editor.html?c=geo-beef-cuts&code=CQOg5gpgLgFASgeQQFQPoAUCCyASACAajwHIB6AEwEMpLTKBne6UyAe1ICEIIAzVAYwCuUeqgBiAJ0oA7fhBD0AbmGIAaPD0GyoAS1bS8MJWACUeAN4AoPHgj8AFpQkiQEiGB30oECQFlKAA4wxFy8AsKikjJyahZ4xgBc8cp4AL4mANzWNjnZrAG6-ngAvBbZNlCsrAA2ugFJ5qmq5XhgEjrkDU0t1e4Q0p1lOcMarBIAttTeEkkw0pTjEGbFAHx484vNIzlUNEkA2sRiOr1QscQAwjXVOj7EALpbOd3DTO0Q9ActNlbbFQCeAQgSQARJMAiCnttwaDQnwhCJxFJZBBId8chtgXgQVweDxIXhSKQ8IA8EEAjCCASRBAKwgVLwgA4QQA8IIB5EDwgBYQQDcICzAEwggEEQKmAThA8HzAAIgdLp6Js_BqYw4_ySxF2lDUErwvUgAxwrEUPgAMjppABrJJQCSCCBQkaKr5_HLmPAq4aY0HHU4Eh05RSUapmpIARgArBabTpvOMAMpQf69Bru4YAIzG5B8V2qY1BAGIxGJML6AAyYNE27YJiRJiQAdQ6UHsSUDsZyTgglBTaexJpk9ACjekUBBhOJgHwQYWAPhBAOwgwsADCCAcRBALwgE5Zo4n7LpXMAXCAT-upd0vIt2-tO7Epm4-N1Fj1en14ABMuZAvqDfxDEHDkejQzPORLZZbM2x6dzACcHAAMwAOwcIWH42F-PiVuQ1a1g-NqNs20q_iC7bSJ23a9pu24qo8KrPgEjj0J4DT9nggCEIIAQiB0uygAyIHggD8IKKeBzlyVKslSM5iu6T4vlGWK_B-KE_qCEhgHGlAwFe_qBngvoAGz3opubqLewEmH2RJ4AOw6sjynE0eu-E2lu2w7sM6JEgAogAHgsAS9NeSQ6n0Azx
 
PYrAAO70OocbCHg5CsB8PZeb58R2PoVASP8UXvPQNnEiJwy6QCQKguCkFpcSNgwticLhIiUQojlOTpesCxYiCLrQKeIyVWq_TkJq2oSHqhrGqa5rJTs1CUNajV5ba9rbJVjrVc6Jz1eofXbJ63pYgGD4TTkAkRkJMbjSNxaJsmaEZlmOb5uVNhrfG-0VlWNZ4HWO1FmJh1tsi2FuD2fbzSMFnDd9q0jYRD02MRpHke-uUjBtr7CV9wxPam6GSdJsnyeoymqXmGkgFpn1A88X0_RDVkVSlX2Rpl2LZf9OQFTi3DwhESLRKi1M2AeIJHrcEgNRDkpobK8qKsqePNRqWq6vqRp4CaZqs8FA1Dbzo2wxiU2HtcXM8yTfyLZeN53nLwxQ1t4PazaMESOJf6ASB4FnZR5tXXBCF3YbIzw62GGvV2724XjwyE2b-N44Dv3A-MJEMGDe7-3gxtvqlQdw24qEIxJUkyXJCno2j6l4Jp2kq4H50jcXlGB_c2SpFk-X_BcjjOAo0AIAUejSDA-SFNI6jmNIrBQL4PiQN1ZrpDX9pj0AA
   
   ### Steps to Reproduce
   
   ```
   
   $.get(ROOT_PATH + '/data/asset/geo/Beef_cuts_France.svg', function (svg) {
     echarts.registerMap('Beef_cuts_France', { svg: svg });
         
     option = {
       tooltip: {},
       grid: {},
       legend: {
           formatter: (name) => name,
           data: ['Filet', 'Collier'],
       },
       series: [
         {
           type: "map",
           map: "Beef_cuts_France",
           name: "Beff", // Общее имя для всей серии
           colorBy: 'data',
           legendHoverLink: true,
           data: [
             { 
               name: "Filet", 
               value: 15,
               itemStyle: {
                 borderColor: "#FFA10A",
                 borderWidth: 5,
                 areaColor: "transparent" // Прозрачная заливка
               }
             },
             { 
               name: "Collier", 
               value: 20.1,
               itemStyle: {
                 borderColor: "#09B37B",
                 borderWidth: 5,
                 areaColor: "transparent"
               }
             }
           ],
           emphasis: { // Стиль при наведении
             itemStyle: {
               areaColor: "rgba(255, 161, 10, 0.3)" // Подсветка
             }
           }
         },
         
         //Example 2: Legend shows, but doesnt show secondary series
         // {
         //   type: "map",
         //   map: "Beef_cuts_France",
         //   name: "Filet", 
         //   legendHoverLink: true,
         //   data: [
         //     { 
         //       name: "Filet", 
         //       value: 15,
         //       itemStyle: {
         //         borderColor: "#FFA10A",
         //         borderWidth: 5,
         //         areaColor: "transparent" 
         //       }
         //     },
         //   ],
         //   emphasis: {
         //     itemStyle: {
         //       areaColor: "rgba(255, 161, 10, 0.3)" 
         //     }
         //   }
         // },
         // {
         //   type: "map",
         //   map: "Beef_cuts_France",
         //   name: "Collier", 
         //   colorBy: 'data',
         //   legendHoverLink: true,
         //   data: [
         //     { 
         //       name: "Collier", 
         //       value: 20.1,
         //       itemStyle: {
         //         borderColor: "#09B37B",
         //         borderWidth: 5,
         //         areaColor: "transparent"
         //       }
         //     }
         //   ],
         //   emphasis: { 
         //     itemStyle: {
         //       areaColor: "rgba(255, 161, 10, 0.3)"
         //     }
         //   }
         // }
       ]
     };
     myChart.setOption(option, {notMerge: true});
     
   });
   ```
   
   ### Current Behavior
   
   Example 1: Legend doesn't show, but 
   Example 2: Legend shows but does not show secondary series until previous 
series is turned off
   
   ### Expected Behavior
   
   Display a working legend that displays all series, when one of the series is 
turned off, the backlight on the SVG should disappear
   
   ### Environment
   
   ```markdown
   - OS: macOS 15.5
   - Browser: all
   - Framework:
   ```
   
   ### Any additional comments?
   
   _No response_


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