Undesired white background being added to dynamicMapLayer

• Browser and version:

All supported browsers;

• Version of Leaflet (L.version):

1.6.0

• Version of esri Leaflet (L.esri.VERSION):

2.3.3

Steps to reproduce the error:

1. Add a dynamicMapLayer to a leaflet map with the following code:

this.mapServer = esri.dynamicMapLayer({
        f: 'image',
        url: URL_MAPSERVER,
        transparent: true,
        maxZoom: DEFAULT_CONFIG.maxZoom,
        minZoom: DEFAULT_CONFIG.minZoom,
        layers: [0, 1, 2, 3, 4, 5]
      })

What happens is: every layer my ArcGIS MapServer provides are rendered with an opaque white background layer below them.

According to Firefox’s network tab in developer options, the image returned by the ArcGIS service for the aforementioned screenshot is:

I was expecting: esri-leaflet to render my layers just like AGOL does.

[jgravois]

would it help to just default to "png32" 🤷‍♂

[jwasilgeo]

@teofilosalgado also what format is being used? Default of esri-leaflet should be 'png24' but the white background makes me wonder if a 'jpg' format is being used.