The datapack is now back in one single file!
Thank overlays for making this possible.
Now this one datapack/mod should be able to function across 1.19 to the newly released 1.21.5. If you run into any problems, report these issues to the GitHub.
In addition to being back to a one in all, I've added some new stuff and fixed a thing:
New Stuff
You can now convert sandstone, red sandstone, and quartz blocks into their smooth counterparts in a blast furance!
Fixes
The cobweb to string recipe that vanished from the 1.21.1 and 1.21.4 datapacks are now back. Sorry for the oversight.