octava line broken in polyphony

[Charles Gran]

Why does the octava line in this example get broken up?


\relative c' {
  \clef treble
  \time 2/2
  << { r2 b'4 b8 c ~ | c2 e4 e8 f | #(set-octavation 1) r4 g'2 c,4 ~ 
| c e2. | r4 a2 e4 ~ | e f2. | } \\ { e,,4 e8 f e2 | a4 a8 bes a2 | 
a' a | a f | e g | a1 | } >>
  << { r4 g'2 c,4 ~ | c e2. | r4 a2 e4 ~ | e f2. | #(set-octavation 
0) } \\ { a,2 a | a f | e g | a1 | } >> \clef bass << { r4 <ees,, aes 
c> } \\ { c } >> \clef treble <d' d'>2 | <b b'>1 | r1 |
}


Charles
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