When using hands to dig a furnace,it drops the block instead of disappearing.

And things like dispenser,enchanting table,hopper,cauldron,brewing stand which are described as unable to dig with hands(In Minecraft Wiki) can drop themselves when being dug by hand,too.

how to reproduce it:

1.set a furnace/enchanting table/hopper/diapencer on the ground(In Minecraft Bedrock Edition 1.16.10)

2.Dig it by hand

3.The block turns into an item