I've found importing MusicXML to be quite useful, but there are definitely a few quirks.

An anacrusis will be put into a full bar, left justified.

BIAB often(?) gets confused by cut time, and probably also by other non-4/4 time signatures.

BIAB has a feature to hide rests in the notation, which is presumably intended to make live-played MIDI look clean and sensible, but also gets applied to XML and it can be rather over-aggressive at hiding them. The option is set from the notation view Opt.->Minimize rests. Unfortunately this is either on or off ... there's no minimum/maximum size for hiding/showing rests. I think it should not apply this from XML, but I think it's just how BIAB works.

MusicXML is pretty complex, combining all the oddities of MIDI with a whole load of oddities of notation. As a consequence many programs are imperfect when handling it.

Jazz relative beginner, starting at a much older age than was helpful.
Kawai MP6, Korg M50, Ui24R, Saffire Pro 40.
AVL:MXE Linux; Windows 11; Win8.1: Scarletts
BIAB2022 UltraPAK, Reaper, a bunch of stuff.