Following your instructions I get the same output. I admit it looks strange, but I next opened the test song xml in Musescore and I think it all looked good (see picture). I even added a key change. I made the original song in F and when I changed to xml and opened in BIAB and in Musescore both stayed in F.
I don't seen the 140 to 120 tempo change. But time signature changes look good. right? Also, BIAB uses some shaded chords in the opened xml, which I am not sure what that is supposed to mean.
I am afraid I would have to spend a lot more time experimenting with this. But for now thats what I get.
![[Linked Image - Only viewable when logged in]](https://www.pgmusic.com/forums/ubbthreads.php?ubb=download&Number=27619&filename=xml opened in Musescore.png)