Collecting wood and creating planks does not unlock the sign recipe anymore, you will also need to get sticks if you want to unlock it.
This datapack makes the recipe book unlock recipes only when you get all the ingredients (the vanilla one will usually unlock them after collecting the main ingredient).
If you already have started a world and you want to use the datapack, open your world to LAN enabling cheats (if you don't have them already enabled) and use the command /recipe take your_username * to delete all your unlocked recipes and start fresh.
This datapack is fully open source, on GitHub you can find the script I created to automate the process and the instructions to port the datapack to your desired version.
A Minecraft datapack that makes the recipe book give you the recipe only after you craft the item for the first time.
A Minecraft datapack that makes the recipe book give you the recipe only after you craft the item for the first time.
