I'm using the W3 Total Cache plugin, and have set it to minify and combine CSS and JS files.
I have also set it to use the HTTP2 preloading capabilities, though, when I load the site in Chrome, I'm seeing the following error in the console for both the CSS and JS files:
The resource [RESOURCE URL HERE] was preloaded using link preload but not used within a few seconds from the window's load event. Please make sure it wasn't preloaded for nothing.
Why is that showing up? The script and the stylesheet are indeed being used, they are clearly declared in the usual places.
I looked in the Network tab of the console, and the script and the stylesheet are both in the 'memory cache' initially, and are then downloaded a second time!
What could I be doing wrong?