Could not reproduce. Appears as user error.
Use this code:
require([
"esri/symbols/support/symbolPreview",
"esri/symbols/SimpleFillSymbol",
"dojo/domReady!"
], function(symbolPreview, SimpleFillSymbol) {
var sfs = new SimpleFillSymbol({
type: "simple-fill",
color: "red",
style:"solid"
});
symbolPreview.renderPreviewHTML(sfs,{
node: document.getElementById("viewDiv"),
size: 25
});
});
解决办法
Do not add the style property to the symbol and the symbol renders correctly.