I had an instance where there were some flowers I wanted to destroy to make way for a farm. I mined the ground under them not thinking about destroying them first. I’m sure had I set the flowers to be destroyed before mining the ground, a Hearthling would have still been able to reach up one block to destroy them, but since the ground was mined first, I couldn’t destroy those flowers without building a floor up one block.
When mining ground under objects, they should automatically get destroyed. This should only affect certain objects, like flowers for instance, since mining into stone is understandable, as the roof wouldn’t likely collapse.