Re: bounce in place makes stereo f...
BTW, I think this is because Logic assumes that if you want to embed pan data into an audio region, it better make it a stereo file first!
Also when I asked before about 'bouncing to a stereo track', this is another function you can use with bounce-in-place. You create a new track, or select an existing one, select the region that you want to bounce in place then choose 'Destination: Selected Track' from the BIP menu.
Its not particularly relevant to your current situation, but its handy to know and can be quite useful. You can add the region to an already existing track of your choice as part of the BIP. This avoids the hassle of creating a new track, moving the new region to the track you want it on, then deleting the extra track.