This isn't an issue with most datapacks, but I've heard of other people having this issue so i thought i should post it.

Whenever my datapack is enabled, the 2x2 crafting grid deletes the items that are put into the slots.  I'm not sure what specifically causes this issue, so i apologize if that would've been needed, i tried to find out what was causing it, but no luck.

this is also an issue in 20w09a, not sure about the other snapshots