When empty, some of the blogs are really confusing.
In particular, the 2X2 shows 2 slots, with the message "empty slots".
It should probably show something similar to what I paste in the attachment.

OR

just 1 slot to show how the block would look with 1 single content.
and it should be full-width only if it's the behavior of the template to be full width if content is missing (which is not the case I believe).