cross-staff notes ignore accidentals
When notes are moved to another staff, their accidentals are still determined by the staff they came from, not the staff they are now on. The attachment illustrates the issue. As a result, the score may look right but the playback sound wrong.
This is low priority, as there is a workaround: set the note to the proper pitch, then make its accidental invisible. For example, hide the redundant ♯ or ♭ (when the one already on the staff is ignored), or the extra ♮ (in cases where the "from" staff has a ♯/♭ but not the "to" staff so it has to be neutralized).
For practical examples, see e.g Rachmaninoff op 33 No 8 in G minor (at meas. 8, 28, 30).