Beaming error

[Richard Davis]

Hello all!

I came across something quite strange today that I couldn't quite wrap
my head around. Why does this code:

\version "2.25.17"
\language "english"

{
  \set subdivideBeams = ##t
  \set baseMoment = #(ly:make-moment 1/8)
  \set beatStructure = 2,2,2,2

  \tuplet 3/2 { c'16 16 16 }
  \repeat unfold 4 c'32

  \repeat unfold 8 c'32

  \repeat unfold 4 c'32
  \tuplet 3/2 { c'16 16 16 }

  c'8 \repeat unfold 4 c'32
}

Beam things so strangely? As far as I can tell, according to this:

https://lilypond.org/doc/v2.23/Documentation/notation/beams#setting-automatic-beam-behavior

The beams should be subdivided in groups of four thirty-second
notes. Instead, I get beams subdivided into groups of four and further
into groups of two. What am I doing wrong?

Best,
Richard