Someone please just end me. It would be the merciful thing. Ive been at this for 8 hours! I found it... I f$^#@ found it.

What it was: <index.html>

 <script defer="defer" src="/static/js/main.3362c51c.js"></script>

What it needs to be: <index.html>

Mind the missing leading slash, it was using root as the path instead of a local path.

 <script defer="defer" src="static/js/main.3362c51c.js"></script>