Hi Pierre,

Thank you very much for the details!  I have added this information to
the existing bug report:

https://issues.guix.gnu.org/52943

Please direct further discussion regarding this bug there, so that
people looking at the bug report will see an accurate record of the
investigation so far.

-- 
Chris

PGP: https://savannah.gnu.org/people/viewgpg.php?user_id=106836