setting the localIdeographFontFamily: "sans serif", When "text field" is set to English, the symbol is not visible？

[fyuanz]

I have a issues when initializing the map, setting the localIdeographFontFamily: "sans serif", layer type: "symbol", correctly displaying "text field" in Chinese, and not displaying annotations when "text field" is in English.
When style glyphs cannot be accessed or 404.Why?
When "text field" is set to English, the annotation is not visible？

const map = new maplibregl.Map({
  container: "container",
  style: {
      version: 8,
      name: "defaultMap",
      metadata: {},
      bearing: 0,
      pitch: 0,
      transition: {
        duration: 300,
        delay: 0,
      },
      sources: {},
      glyphs: "./online-fonts/{fontstack}/{range}.pbf", // When style glyphs cannot be accessed or 404
      layers: [],
  },
  pitch: 0,
  preserveDrawingBuffer: true,
  localIdeographFontFamily: "sans-serif",
});
mapInstance.addSource("sourceId", {
  type: "geojson",
  data: data, // any data
});
map.on('load', () => {
  map.addLayer({
    id: "layerId",
    type: "symbol",
    source: "sourceId",
    layout: {
      "visibility": "visible",
      "text-allow-overlap": true,
      "icon-allow-overlap": true,
      "icon-ignore-placement": true,
      "text-max-width": 10,
       // English or Number not visible
       // "text-field": "value",
       // Chinese can be visible
      "text-field": "上海",
      "text-font": ["sans-serif"],
      "text-size": 16,
      "text-line-height": 1,
      "text-padding": 0,
      "icon-size": 0,
    },
    paint: {
      "text-opacity": 1,
      "text-color": "#000000",
      "text-halo-color": "#FFFFFF",
      "text-halo-width": 1,
      "text-halo-blur": 0,
    },
  });
})

[HarelM]

I'm not 100% sure but I believe the Chinese font is taken from the browser while the English is taken from the glyph URL.
This is how Maplibre is able to show Chinese text.

[fyuanz]

I feel the same way, In theory, English can also be obtained from browsers，it's strange😵‍

[HarelM]

It's a performance consideration, using the glyphs is much faster than using the browser fonts.
For Chinese it's not possible to do due to number range I think, but for Latin the it's possible and faster.

[fyuanz]

ok...，thanks!
This question has been bothering me for a quite long time.