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
Linked issues
Comments

Thank you for your report!
We're actually already tracking this issue at MCPE-33950, so I will resolve and link 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 to see if the issue has already been mentioned.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki