Radial gradient has wrong position

[Monokai]

I'm converting this SVG:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg version="1.1" preserveAspectRatio="xMidYMid meet" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 500 500" width="500" height="500">
	<defs>
		<radialGradient id="gradient" gradientUnits="objectBoundingBox" cx="0.5" cy="0.5" r="0.5">
			<stop offset="0" stop-color="#ff0"></stop>
			<stop offset="1" stop-color="#f00"></stop>
		</radialGradient>
		<mask id="mask" x="0" y="0" width="500" height="500">
			<circle cx="250" cy="125" r="250" fill="#fff" />
		</mask>
	</defs>
	<g mask="url(#mask)">
		<circle cx="375" cy="325" r="125" fill="url(#gradient)"></circle>
	</g>
</svg>

with this script:

const doc = new PDFKit({size: [500, 500]});

SVGtoPDF(doc, svg, 0, 0, {
	assumePt: true
});

to this PDF: output.pdf

But the position of the gradient is off. (changing assumePt to false yields a different result, but the gradient is still off). I've attached two screenshots to compare:

SVG:

PDF:

Also, when trying to load the resulting pdf file in Adobe Illustrator, it says An unknown shading type was encountered, but the gradient position does seem to be correct.

Any ideas?

[edvinbrobeck]

Any solution to this?