This turned out to be more interesting than I thought. Gradients and blurs are common in UI design. The Figma app actually does blurs wrong, while Chrome/CSS renders them correctly. This is good to know.
I am going to disagree with that chrome, or any browser, for that matter, renders blurs correctly.
In fact, I'd go as far as say that CSS blur filters are embarrassingly low quality. One of these days I am going to finally say fuck it just use canvas on top of my whatever I have to blur.