JS not working under a custom domain on Cloudflare Pages

The website loads the CSS styles via <script src="CDN tailwindcss.js"></script>, and the request status shows as successful, but the CSS styles are not applied to the website. However, the CSS works correctly on the default domain *.page.dev.

I initially asked AI about this issue, and while it provided a lot of information, none of it resolved the problem.

Through a Google search, I found an article titled Cloudflare Pages - Cloudflare Breaks CSS on Its Own Domain, Works on .pages.dev. The article mentions turning off 'Auto Minify'.

But I went straight to disabling the 'Speed > Optimization > Content Optimization > Rocket Loader' feature, and immediately after refreshing the site, everything returned to normal.