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
Thank you for your report!
We're actually already tracking this issue in MC-172272, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki