Non max rectangle when using d3plus largestRect - d3.js

Question

When I use d3plus.largestRect it often doesnt return the largest inscribed rectangle. Any ideas whats going on, or what I should do to try to debug?
Someone took it from d3plus and made it its own repo here if its helpful.
https://github.com/rossjs/largest-rect-in-poly-geojson
export function maxRect(polygon, userOptions) {
// polygon is a geojson polygon and aspectRatio is a number that is the ratio of width to height
// we want to return a geojson polygon that is the maximum rectangle that fits inside the polygon
// and has the given aspect ratio
// we need to convert the geojson polygon to an array of points
var points = polygon.coordinates[0].map(function (coord) {
return [coord[0], coord[1]];
});
if (userOptions) {
console.log("userOptions", userOptions)
var options = userOptions;
} else {
var options = {
};
}
// we use d3plus to calculate the rectangle
// aspect ratio is the ratio of width to height
// var rect = largestRectInPoly(points, options);
var rect = largestRect(points, options);
console.log(rect)
return rect;
}
Example where rectangle is wrong. This happens regardless of which options I pass to it
{
"type": "Polygon",
"coordinates": [
[
[
-121.498361304,
38.622343198
],
[
-121.498593986,
38.622343198
],
[
-121.498593986,
38.622508322
],
[
-121.498565407,
38.622508355
],
[
-121.498565823,
38.622465787
],
[
-121.498410255,
38.622463692
],
[
-121.498409129,
38.622508534
],
[
-121.498361664,
38.622508588
],
[
-121.498361304,
38.622343198
]
]
]
}
Some examples:
So I did some digging and it looks like it starts erroring before event 3, which should be a modifOrigin. Investigating what that is.