So I have a datapack Ive been working on for the past few months (1.16), and I actually recently ran into an issue where chiseled_stone_bricks and stone_brick_walls just dont work? However, I was told this issue is "outdated" and to update to 1.17. So I did, because maybe the issue got fixed...

Nope.

Datapacks do not work at all.

It says "Data pack validation failed".