Why does chrome continue to give 404 errors for a file that’s not included anymore?

For a while, my website used to have two JS files, subtitle_tagline.js and lazysizes.min.js. A while back they were both folded into the main theme.js directly, and all the references to such were removed. Grepping for the file names in the final source produces zero results.

Chrome’s inspector still marks the requests it’s making as 404 (which is accurate), citing “(index)” as the initiator. Well, I can view source and Ctrl-f, and it’s most definitely not in there.

This shouldn’t be a caching issue, since I’ve cleared the entire cache multiple times, and dev tools are supposed to run in no-cache mode when they’re open regardless. Any ideas why a file with no references is still being requested?