I'm trying to upgrade the TailwindCSS in my React app to v4.

Most of the upgrade went fine, however my Icomoon icons are no longer showing up. Instead of the icon, a simple square outline is shown. It seems something is wrong with the 'content' aspect, since if I turn that off in the inspector, the outline disappears completely.

I tried redownloading the Icomoon font but that didn't work, so I'm asuming it might be related to the utility layer that the migration introduced?

In my Icomoon stylesheet, it just says this for each icon:

.icon-[icon-name]:before {
  content: "\e902";
}