The advancements json for the 1.17 fabric release 2.1.0 has misplaced brackets near the end of the file causing the server to not recognize what the requirement "miningbench" is. This is easily remedied even by the end user, but figured you guys might want to be aware of the issue if you weren't already. :)

Where exactly is this issue at in the JSON?

It concerns several lines around 247 - 271. It's very obvious when opening in notepad++ what has gone wrong thanks to the proper formatting you guys do with the indentations.

This:

Should become this:

Forgot to close this. Issue accepted.