100 % derivation available at bordeaux and Berlin, but package Musescore has to be built on my laptop

[Gottfried]

Hi Guixers,

when I did a
guix package -u

and also
when I checked it beforehand
with
guix package --upgrade --dry-run
if 100 % derivations are available ( I did this the last 4 times)

nevertheless
the music notation program "MuseScore" had to be built on my laptop.
With my 64 GB CPU it took 1 hour (I did it twice).

But why is it built on my laptop if the derivations are 100 % available 
and I was not informed that e.g. MuseScore will be built at my laptop.

The same with the package "calibre".

Gottfried

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