I'm working on a modpack for 1.16.5 and I am not able to get a custom Advancement tab to appear, even just using the default example advancements on startup. From reading the wiki, it seems the default files should show up as a simple advancement tab without any modifications.

This is what I see on startup:

Hi, please try deleting the 'customadvancements' folder inside your minecraft directory and let the mod regenerate the example files. Maybe this fixes the issue. Otherwise please provide the log so I can have a look if any errors occurred.

Closing this due to no response.