FS#10990 - block on the last top line grows with lines removal in the bottom
There is bug in rockblox: when you manage to push block exactly to the top of the field, game neither finishes with error, neither continues normally. this block starts growing when you destroy lines in the bottom.
I've made small video and put in into youtube (sorry for bad quality and sharpness =):
look into the left top and see what happens when lines are removed. bug is quite easy to reproduce. right side works like the left.