Dynamic variable background URL not displaying

I uploaded my desired bot background on Imgur. When I fill the image URL manually in the Theme's Global tab Background "URL", the background is properly displayed. However, when I use my defined variable {{bg}}, which I define as the very first block of the flow with the same exact image URL, and use {{bg}} in the Background "URL" field, it doesn't display it. As you can see, the browser CSS thinks the actual background-image is the raw variable call. I suspect a bug where the variable is not executed, therefore its value is never returned