Hi, thanks for your report. I'm currently trying to reproduce a sbuild setup where this happens.
With a "normal" setup (i.e. debootstrap and then add experimental, this does not happen and apt does the right thing). I've got no clue so far why the debian buildds for experimental work differently than the "normal" setup, and why/how they experimental buildds are also different from the unstable buildds. Regards, Daniel
