Enterprise Icons are broken / missing
Problem
Object icons, especially for resources, are showing a placeholder icon instead of the correct icon (see picture).

Solution
The user has to clear their browser cache.
How to perform a hard refresh in some of the most common browsers:
Google Chrome: Press Ctrl + Shift + R
Microsoft Edge: Press Ctrl + F5
Mozilla Firefox: Press Ctrl + Shift + R
Please note that the key combinations may vary depending on your operating system. If you're using a mobile device, the process for hard refreshing might be different.