Bedrock 1.18.10 Furnace gives XP when placing coal or an ore in the third hotbar slot picking it up and placing it again continue to gives XP

Start a new world in survival. Hit a tree to get some wood and make a craft table and wooden pickaxe. wander around until you find some coal and dig it. open your inventory and put the coal in the 3rd slot of you hot bar. open the furnace with use and pick the coal in the 3rd hotbar up and put it right back in the same slot...do this pickup and drop over and over your XP levels go up. You can also do this with ore and it gives more XP such as diamonds/gold/emerald/scraps