My Cellar is behaving strange.

So in the Image i attached the cellar only works as long as the Block above the door isnt Placed. As soon as i Place a Block that would close the Cellar off the Game registers it as a room and Increases the Spoilage rates to Normal. As it is now the Spolage rate ios reduced like it should be in a Cellar but the game doesnt register it as a Room.

Can anyone Please Explain this to me?

https://preview.redd.it/e9sixq1w0hkg1.png?width=3840&format=png&auto=webp&s=8f5fc707b54a258e0032741306cb5122a842adee