img css breaks website layout

This is an old one, but I similarly hit a page not found on /modules/contrib/we_megamenu/assets/css/we_megamenu_backend.css.map

This patch does not apply against 1.16 without error.

The issue is still present on the latest version (`8.x-1.16`). Re-rolling patch.

I'm seeing issues with the CSS from this module breaking Bootstrap modals and even in the admin theme the background colour of the breadcrumb is being set to white.