No option found for "Generate Structure" in Cheat setting and Chat/command

there is no found for "Do Generate Structure". i looked where is this option in Cheat setting for " "Do Generate "Structure" and i not found it where. and i doing: "/gamerule dogeneratestructure false" and it say syntax error. Even i tested multiple /gamerule dogeneratestructure false and STILL nothing work. look in screenshot on attachment.

please add this option in 1.19 update