Switching staves with \times looks odd

[Richie Gress]

Hi.
I'm having a small issue here. I'm writing a score for Mutopia which involves some beamed notes, which are in a \times 4/6 { ... } block, switching staves like this:
\times 4/6 { \stemUp <c, ees aes c>[ <ees aes c ees> <aes c ees aes> <c ees aes c> <ees aes c ees>16.\f \change Staff="RH" \stemDown <aes c ees aes>32] }
This works, except that the "6" is displayed not above the beam, but above the "RH" staff.
Is it possible to force the "6" to appear above the beam as intended?
I can provide my .;y if you like.
Thanks.