> 
> There is however one residual issue.  If the following MWE is compiled under 
> lilypond 2.25.18, the PDF output is  as expected.  However if it is compiled 
> under 2.25.25, an unwanted markup "[semibreve] = 50" appears at bar 2.  How 
> is this best avoided?
> 

While it may be a quick-fix solution, adding:

  \once \override Score.MetronomeMark.transparent = ##t

...right before "#(ac:tempoChangeā€ does make the tempo go away. There should be 
a way to implement that in the scheme code itself, but at very least turning 
the transparency on for one single instance does make the tempo mark disappear…

All the best,
Yoshi

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