The output sample count is not equal to the input sample count in offline mode

[Molanischen]

while using Rubberband to perform pitch shifting contiuously, I found that when the pitch scale changes from postive to negative, the output sample count is not equal to input sample count. I reset the stretcher before reset the pitch scale. However, in offline mode, after the study step, the output sample count should be equal to the input sample count. Is this situation normal or not?