I have submitted the following bug for this issue: [BUG-000106674: MapImageLayer does not honor default visibility of sublayers defined in a map service using ArcGIS API for JavaScript 4.4.] The workaround is to programmatically set the sublayer's visibility as follows: var layer = new MapImageLayer({ url: "http://", sublayers: [{ id: 30, visible: true }] }); You will be able to track the status of this bug via MyEsri https://my.esri.com. Thank you for bringing this issue to our attention.
FYI-
But other invisible sublayers won't be listed in the LayerList widget. Is there any workaround?
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