\version "2.25.24"
\score {
  \new Staff {
    \time 2/4 
    << { \tupletSpan 8 \tuplet 3/2 { a'16[ a' a'] a' a' a' a'[ a' a'] a' a' a'} 
}
       \\ 
       { a16.*8/9 32*4/3 16.*8/9 32*4/3 a16.*8/9 32*4/3 16.*8/9 32*4/3 }
    >>
  }
}

\score {
  \new Staff {
    \time 2/8
    << { \tupletSpan 8 \tuplet 3/2 { a'16[ a' a'] a' a' a' a'[ a' a'] a' a' a'} 
}
       \\ 
       { a16.*8/9 32*4/3 16.*8/9 32*4/3 a16.*8/9 32*4/3 16.*8/9 32*4/3 }
    >>
  }
}

The first example in 2/4 produces the short stem of the third 32nd note 
pointing to the right.

In 2/8 it is correct.

Why?

Btw, I solves using \set stemRightBeamCount = #2 \set stemLeftBeamCount = #3, 
but this should not be necessary.

Thanks 
Thomas

MacBook Pro M1 /  MacOs 15.3.1

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