In my first play-through of Alchemical Lab, I accidentally placed two towers on either side of a chest spawn, a bit too close.
I found that I could not open the chest as a result. Fortunately, selling the towers (iirc I had to sell both) allowed me to open it.
Is it possible for a poorly-placed defense to prevent a chest from spawning altogether, or will I always be able to sell the defense to open the chest should I make this mistake again in the future?

