helgasoft commented on issue #20692:
URL: https://github.com/apache/echarts/issues/20692#issuecomment-2596901738

   not-a-bug, setting a property to _null_ is like not setting it at all.  
   ```areaColor:null``` should be ```areaColor:'transparent'```, then you get 
state transparency and can add visible districts, etc.
   
[Demo](https://echarts.apache.org/examples/en/editor.html?helgasoft=map+geojson+drilldown&code=PTAEGMHsDsBcCcCWAjArrRNTIJ6gBYCmANgOYCGAzpAGawB0UAtqAFBM4DC-58Dl-SAHcAMpHIATRNFIAKAJQBuVgDdeoeIUqgAvKADaAXWUASekKLRZrUKDOlCsWQCUA8q4AqAfQAKAQQ8ACVAAalAAcmAJclhyYCpKR2AHSGAAVQBlP3oAK2pocPlQEHxYWAAHSgAuEEJwHj5KenJy8nrCekh4UmBCAA9yJnLiLSiYuISklPSs3PzWeXoJGEJZGlRocAwsWTyYIoBvGw0tenLUAV38pWOzC0IrY9t7R1lw0orqkHAJaDmJEiIFTwejQKb4YAbRCwQgSSixGGUKKIeFILaUAACmhoSKIkiRpHwAFpWg4kfCYqM_ABpYCUYgSVDADL0FJ7AryY6LZZgtYbLaYaCgK77UAHWxPE5Nc6Xdk3WzPcyWawKhUvJzvMqVGrAH5_PIA4hAkFg2DJCFQmFwhGjKSoxDorGEHHAPFw80k8hkuk2pE0ukMpkeVmESDswqS7krPmbbZCkXQQ6S2yaaUXfAJ-UQGDw0AXcgAKXyuil-gADMZjlBoLnwABHEup_QARkrtmrtdgja0-gATG3QBxuLwGPhEACxJJpHIs5piJBwCWjqq_MQqABrchVMXJ0AjOjbonNgDMzYANLvYJBytvewBWC-q2xCcewfDb5t3yUAX0fCsC5BCOQiCINuy5PvusCHs2zZln-qpXjeoC9gAHPBCovhIb7bl-qq_pK4Q-KghB8JAoDOA6kDhGBu6QYeADsABs6G2Iht7MbumHYchP7HN-yi2HUDSwE0mikCiMLwAAsi0byZH44RnnmlCFtciggEpc4Llm-ZFjA9A0IQMSoKmZzprI9ZKVsNzHNecZLpKGCwCMYGgDCfRQRENLZh
 
sGBaOEoD4QhkCQMQGBIeBCFIKQDjwNu4TQoQTDhD-6EqCiqDkMQMkRbRzqeeE0WlIpu7SM45AyIQNFPgqUDznFBi7qq4QAMSnsejEAJx3iVNXNS1AAsd70XeyADb1fW2K19EDZIEjNopETpaFjgTZNrUSPRx5lr29FrX1rXkHeZY7YxKWTYYu5BU-7mefo4SBIghKLeEYhCOEhgsRAWXgKga7IC5bnwMRqWOSFxDIJAfTVU-AjCNuCDEV9IBdIgDwFSoJEYOAWX7SmT2lB-56Xte8WIXjoCGcZmgwzV0SxAAamjQiuZokiuNAxA4NuNBZYkgVfSmWhXjTYrXTVKmY34lAAJJMF6VVi1doOqokSBaNu-i7pFT7QIMivhB4wsU6xODlAb8vlCbg4tPF8mLQAXiFTBVANVnoyRVT6EeA3NvQA3Hr2vv0WejEDfQsF3p9TWgEl5Q8JQKKuf9JBgXDLNA8R37i0-iVMBksA4IDOs1bwRmcKFXRk_AFWUK0mhwItMe2JD8AAvAFf1duABEANtOu3dKa37cAOqvu-oDNjnqr01ujWTbY4p60wBsZItajEMR24DQLzdiqAy8Gx469ZVvk8oShu8XYLoAF5SXiz5rtggNmTAr3AsKgJA6B70v-vxaucgyBBjkBPpvRWA0UK9l7DtY8V8F5_xXgAtclBNxgLPltZsA0BqdXgZNRBBs_BICdnrdBitGJ3jvIHSheC-oEIAfATcNYqBkNvJ1HBJ5my0JqvQiInAsqIBoF0aAiBQFKQ3mfY8KEyy-wDmWbhT5eHhE7l0SQVFxGn0VneZsKERpQIUaqJRFdoBggFL9WArDQDHjvJ1Msx4Br0QMQqJRAAREggEy6WM6s2eiZZOq9icYvA-_8IguIkmiLstBQCd1QEwZAojLGMUDskwJ-9D7xQAGL1XHGI0AEjFbNk6qeEajFL7T0UcEpBEQADioZugJI0eA7cnVvEtKGqkpRAEgIgUsSefx7UOmV
 INjLaIghek2OGqhJxl0arfklDMwKAlBxcGEvQRIsBXDlDjLIOygobjfn2YcxQQA)
   
   
![Image](https://github.com/user-attachments/assets/1dd7edbf-4fa6-41ec-ae71-235a4c05b3c8)
   
   📌 please close issue if problem solved.


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