Pagebreak: can't go back to previous page

I have use 3.x-dev version to build several forms, then came to realized the "Previous page" in Pagebreak field doesn't seem to work. This may mean I have to downgrade it to 2.x, which also mean I will have to rebuild all the forms again. While I agree it is my fault to begin with for choosing to use the dev version, but I just want to confirm if this is a bug before I go about rebuilding the forms again.