Bounding box does not work with the new version of the forge generator 1.12.2

Custom bounding boxes are not working after adding the option to add more than one box. When I open a world and place the block with the custom bounding box, the game closes instantly. However, in previous versions, when there was the option to add only one bounding box, this feature worked smoothly. Now, I cannot use any bounding box, not one alone, nor several together.