electroheadfx commented on issue #19959:
URL: https://github.com/apache/echarts/issues/19959#issuecomment-2408899570

   Maybe fix too the label z-index with lots data ?
   
   I re-open the issue because I did a reproducible project with this issue, it 
seem it happen when there is too much data. I put a multiplier in line 
https://github.com/apache/echarts/pull/1, when multiplier = 1 it works:
   [echarts multiplier data = 
1](https://echarts.apache.org/examples/en/editor.html?c=line-marker&code=MYewdgzgLgBAtgVwDZQJYAcmoKYCcYC8MAjAFCmiSygJhQCyAhgB7GEkAMXMAVPMmkw5cAbgrhoMGnSbMATO2JcOvfigxY8Y8VRgATbCkbsFAejWDNucpUl7GURmyIBtALpiAZiHwAKVOwcIjABADxSILQMLMTBqADU8QCUMADepDD6Dk4AdOgIEAAWvi4ZmZwALABsVQDMMAC0MP6qBkZJADRlmRUAnGzxIaocObW1XeUwAEQAagDyUxPlTFCFObiMYHogcL4pfC2DxJ3dJEuZxEtuSWIAvjYSsPaOCq4epN5-AURBQ-HS0XkcUSKXSmWejDkeQKxVKkyU1TqjWaAT4bUcJ0mfQGQz4IzG52m80WpxWaw2Wx2e1UhxImPKl1OjMy1zu5BA6DQ4HYYJgAHdUHpVgAuabEACsAHZauhmCTMgBzXCC0Vw8q8yZIbCeKCijiEzLKhWFXUwfWnTJFEB80VQXAIbAGkJ6PVOgBGPgMuAAwiAkD5RVMAMTEABicl6tUl8smMCgHNFVXNsZghWwqGNpqmciTOUl4tlMcmAqFhUDErkMrlhNuhI15S1OtdFpgRpNzZTVptcftjpbKrOLY9uC9vv9uEDIfDkejTvj6FFtTkxDz4qdaYz7emOZG-cLTpLIrF4sr-9OtdO9cyjdNydjbdvTq7tt7c4TZvX6czovFa5bh7LY9T2rIcQCgeM4EDAAODgAFIixgC9JivGAbw7e9N0fFt50TYgoM_TDRQqP8UwA8sTyrBDLUKa0XwdJ9CkYbY-TmTxPAgbAoAADSIhimOtVj2M4gBNXiWyKfi-THANplwBU3UYXx9Q_FSOCSKiYAk5iACEkAQCcP1Akc8AAdUFI870yJCYDcJYIQ4001UyFCB0s8o9FQOB
 
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   When multiplier is 2, it double the data, the z index in label issue happen:
   [echarts multiplier data = 
2](https://echarts.apache.org/examples/en/editor.html?c=line-marker&code=MYewdgzgLgBAtgVwDZQJYAcmoKYCcYC8MATAFCmiSygJhQCyAhgB4CMhMrADDzAFTxkaTDlwBuCuGgwadJs2IduvAYhQYseCZKowAJthSMOigPSD1IvOUrS9jKI3ZEA2gF0JAMxD4AFKg4uMRgAgB4ZEFoGFlZg1ABqeIBKGABvUhh9BycAOnQECAALXxcMzM4uABYANmqAZhgAWhh_fn1DRySAGjLMyoBOdniQtq4curqe8pgAIgA1AHkZqfKmKEKc3EYwPRA4XxSBVuHWbt7OFczWFbckiQBfGylYe0dFVw9Sbz8AoiCR8KyaIKOKJFLpTKvRjEPIFYqlabcGr1JotAICAxGM7TAZDEYCMYTS6zRbLc5rDZbHZ7A5tY6cbHla7nZmZW4PcggdBocAcCEwADuqD06wAXLNWABWADsdXQzDJmQA5rhheKEeV-dMkNhPFBxVxiZlVUrCvqYIbzpkiiABeKoLgENgjSE9AaXQAjHwGXAAYRASB84pmAGJWAAxYj9OrSxXTGBQLni6qW-MwQrYVCm80zYgpnLSyXyuPTIUiwrBqXEOUK4n3Yla8o6vXuq0wE1m1tpm12hOO51ttUXNte3A-_2B3DBsOR6Oxl2J9DiurEVgFyUujNZzuzPNjQvFl1lsUSyXVw_nevnRuZZvm1Pxjv3l09-39hdJi2bzPZ8WSjdtseFanuetYjiAUCJnAwYABxcAApCWMBXtMN4wHeXaPtuz5touyasDB37YeKlQAWmQGVmeNZIdahS2m-TovoUjC7AKCyeJ4EDYFAAAaJFMSxtrsZx3EAJr8W2RSCQKE5BrMuBKh6jC-IaX5qVwSQ0TAUmsQAQkgCBTl-4FjngADqwong-mQoTAbgrFCXHmhqmRoUO1nlHo
 
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