CSS Loading animation not animating in NW.js (node-webkit)

Here is a jsfiddle with my CSS loading animation working properly.

However, when I use the same code in my node-webkit app, the SVG path and colors are static and show no animation.

After a bit of research, I tried adding

"chromium-args": "--enable-threaded-compositing"

to my package.json file as per the solution to this issue. Unfortunately, this did not solve my issue.

I'm using a CSS animation for my loading screen as per advice from the second answer in this post.

My animation is a slightly altered version of this CodePen.

Has anyone had similar issues with CSS animations in NW.js? Any reason why this animation might not be working?

I previously had just a simple spinning CSS animation in place and it worked fine in my NW.js app. I'm confused by this inconsistency.