acciaccatura & mis-predicted

[Gianmaria Lari]

I'm sure this is a trivial issue but I need help to understand why this code...

\version "2.21.0"
{
  \acciaccatura cis'8 d'1
  \acciaccatura cis'8 d'1  
}

... generates this log:

[....]

programming error: mis-predicted force, 108.120472 ~= 108.620856

continuing, cross fingers

programming error: mis-predicted force, 108.120472 ~= 108.620856

continuing, cross fingers

[....]

The same code in lower octaves works correctly. For instance this one....

\version "2.21.0"

{

  \acciaccatura cis8 d'1

  \acciaccatura cis8 d'1  

}

...works without generating errors. Any help?

Apologies if I'm missing something obvious!

Thank you, g.