What happens?
You have two temperature extremes in a small area.
Humidity happens.
The humidity rises and forms condensation on the evaporator coil. The coil, being very cold, freezes the water. The coil is plugged up and can't cool down the fridge now. The compressor shuts down, and the temperature rises,and the Chef comes around asking:
"Which (deleted) --ing idiot put hot food in the walk-in!!!!!!!"