Two layers on different CRSs overlap half a screen apart

• A planning PNG covering 116.0 E~116.6 E, 39.7 N~40.1 N shrinks into the top-left corner, offset by most of the screen.
• With extent [12913000, 4820000, 12980000, 4865000] the position is right but the image is compressed about 1.3 times vertically at 40 N.
• The offset grows as you zoom in.

1. Print layer.getSource().getProjection().getCode() for every layer and compare with map.getView().getProjection().getCode().
2. Check the extent magnitude: single or double digits are degrees, seven digits are metres.
3. Reproject the extent with ol.proj.transformExtent(extent, 'EPSG:4326', 'EPSG:3857') and re-add the layer.
4. Declare projection: 'EPSG:4326' on the source so OpenLayers reprojects it for you.
5. Verify at zoom levels 10, 12 and 14 that the error does not grow.

Declare each source's real CRS so OpenLayers reprojects it; for ImageStatic, which stretches rather than reprojects per pixel, transform the extent into the View projection first.

console.log(view.getProjection().getCode());            // EPSG:3857
console.log(imgLayer.getSource().getProjection().getCode()); // EPSG:3857（默认）
console.log(extent);   // [116, 39.7, 116.6, 40.1] 单位是度，与 3857 不匹配

import { transformExtent } from 'ol/proj';
new ImageLayer({
  source: new ImageStatic({
    url: '/data/plan.png',
    projection: 'EPSG:4326',                       // 关键
    imageExtent: [116.0, 39.7, 116.6, 40.1]
  })
});
const ext3857 = transformExtent([116.0, 39.7, 116.6, 40.1], 'EPSG:4326', 'EPSG:3857');
new ImageLayer({
  source: new ImageStatic({
    url: '/data/plan.png',
    projection: 'EPSG:3857',
    imageExtent: ext3857
  })
});
new VectorLayer({
  source: new VectorSource({
    url: '/data/roads.geojson',
    format: new GeoJSON({ dataProjection: 'EPSG:4326', featureProjection: 'EPSG:3857' })
  })
});

• Multiplying the extent numbers by 111320 and assuming that converts degrees to metres at every latitude.
• Expecting ImageStatic to reproject the image itself; it only stretches it into the given extent.