Yes, we’re aware of this one as well. It’s tricky because there is inherent ambiguity in how accidentals ought to carry over when the number of staves changes even from a philosophical point of view, e.g. when going from two staves to one, does it make sense to show cautionary accidentals arising from both the first and second divisi sections that have now rejoined a single staff, and so on. But from a purely technical point of view there is a further problem, which is that accidental calculation is inherently based around an individual staff, and trying to take multiple staves into consideration is impossible at the present time.