Ideally, the number of growth sequences should double by the time the game is done. That said, the girls will remain visible on screen, so they will continue to get bigger but no Giantess stuff.
Are you using an old save? The release post explicitly states that saves from v0.16 or earlier will not work. You will need to start a new playthrough.
If you could, please report any errors or bugs in the game's discord. There is a #bug-reports forum where you can provide information on any issues you encounter. Please make a post with a description of the error and a screenshot, to better help me diagnose and fix any problems.