Let me preface this by saying, I have been using the same data pack since they were a thing in snapshots.
I have not changed it in any way, and it has worked withouth fail on all snapshots and pre-releases until now.
Data pack is in the datapacks folder, it is titled, and filed correctly.
But despite my doing the /reload command, it will not recognize there is another datapack in the /datapack list available command.
Did they change the structure or disable datapacks for pre-9?
Nevermind, apparently, the game wants me to look bad. It's working properly now.