Hairpin.to-barline broken?

Hi Lilypond users,

No matter if ##t or ##f, the hairpin always ends at the e2 here. I doubt it is
broken, there must be some misunderstanding by me.

%%% BEGIN
\version "2.26.0"

Music = \relative c' {
  \override Hairpin.to-barline = ##t
  a4\< c e2\! | d4 4 4 4
}

\paper { ragged-right = ##f }

\score {
  \new Staff \Music
  \layout { }
}
%%% END

Best regards
Michael