Finally fixed in commit 0d5578c12beec105f5ec113cc50deab703270a82:
~$ guix environment --pure guix -- ./pre-inst-env guix build \
--{check,no-grafts} libreoffice
successfully built /gnu/store/...-libreoffice-6.4.6.2.drv
successfully built /gnu/store/...-libreoffice-6.4.6.2.drv
/gnu/store/25q6nl2l2k3nks0rrh2ah5qsxr3mqy3a-libreoffice-6.4.6.2
Closing, though it remains to be seen whether it works across file
systems.
Kind regards, T G-R
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