When the song is set to 'stretch audio files to song tempo' you can't use audio bend on a transposed sample or it will multiply the pitch effect by 2.
I created a ticket for this a few updates ago (about 6 months) and was told that it was a known issue, but this doesn't seem to be fixed yet. I bought studio one thinking that this would work in conjunction without fiddling and switching settings.
Is this bug on the roadmap or is this just never going to be fixed?