While I was working with command blocks, a weird glitch appeared to happen, where when I filled an area with air, a stone button I was trying to fill to air, broke and dropped the item.

I then looked further into this and it appears to be that when there is a block that connects to a wall in the east and south directions, the block will break as if the player broke it in survival and drop the designated item. I tried it with buttons, banners, levers, torches, tripwire hooks, ladders, and signs, and all of them broke and dropped as an item.