Yeah, I guess I forgot to take the boss into account for the level size restrictions. Usually it tries to cap it so that everything fits without overlapping with the hand. The boss basically adds a new tile on top (when it's there at the top) and thus the actual height should be one less. Adding to my to fix list.
And for the bigger issue. Hmm. Must be still something wrong with the tiles that boss breaks. Will investigate...
Thanks for reporting these! ❤️