Many items don't stack properly in inventory and chests

It's often the case that like-items that should stack in a chest or inventory don't stack.

For awhile I thought maybe the new update introduced a feature where wooden items crafted with different kinds of wood would no longer stack, even if they look identical, since it is most common with chests, torches, wooden pressure plates, and trap doors. However, I've seen this on non-wood items now too, like droppers. Seems like it's most common though w/ wood items.