In the new Minecraft snapshot "24w18a" in either a crafting table or the crafting menu, if you put a block that can be crafted and uncrafted to its original state like a diamond block, if you uncraft the diamond block you will receive your diamonds back but also still have the diamond block in the crafting table that you can take out of the table. When you take the diamond block out you can put it back in the crafting table to craft it again into 9 diamonds. this also works with other blocks such as Emerald blocks, Copper blocks, Netherite blocks ect.