Array.findLast() does not seem to be available

Four months ago, Array.findLast() was added to the polyfill-library:

https://github.com/Financial-Times/polyfill-library/tree/master/polyfills/Array/prototype/findLast

But in the URL builder, it is nowhere to be found:

https://polyfill.io/v3/url-builder/

And when I fetch the polyfill.js file on a browser that does not support the function, e.g. Firefox v103, I don't find its definition in the returned polyfill:

https://polyfill.io/v3/polyfill.js?features=all

What am I missing?