Issue with long beams & funky durations

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Hey all,

The command:

{
\cadenzaOn
a128*38 [ e'128*38/2 a128*38/3 e'128*38/4 a128*38/5 e'128*38/6 a128*38/7 
e'128*38/8 a128*38/9 e'128*38/10 a128*38/11 e'128*38/12 a128*38/13 e'128*38/14 
a128*38/15 e'128*38/16 a128*38/17 e'128*38/18 a128*38/19 e'128*38/20 a128*38/21 
e'128*38/22 a128*38/23 e'128*38/24 a128*38/25 a128*38/26 ]
}

Is issuing
warning: unterminated beam

However,

{
\cadenzaOn
a128*38 [ e'128*38/2 a128*38/3 e'128*38/4 a128*38/5 e'128*38/6 a128*38/7 
e'128*38/8 a128*38/9 e'128*38/10 a128*38/11 e'128*38/12 a128*38/13 e'128*38/14 
a128*38/15 e'128*38/16 a128*38/17 e'128*38/18 a128*38/19 e'128*38/20 a128*38/21 
e'128*38/22 a128*38/23 e'128*38/24 a128*38/25 ]
}

is fine.

Is there something wrong with my code, or is this a bug?

Cheers,
MS