guardians floating just after leaving the spawn

dried up the whole oceanic monument and disrupted every structure and made a production of guardians, but when the monsters spawn and leave the spawn, they do not fall into the trap, they just float at the entrance to the tube. glass that I made for trap and dying of fall and obviously this is not happening, this bug is deis from version 1.11.0.7 beta was when I finished this farm,I want to know if this bug has already been fixed in the new beta 1.11.0.9?