What happened to libreoffice-common in archive?

[Vincent Lefevre <vincent@vinc17.net>]

How can the following be possible?

Note that I have not changed the mirror, and "apt update" does not
give any error.

cventin:~> apt-show-versions -a libreoffice-common
libreoffice-common:all 1:5.4.2-1 install ok installed
libreoffice-common:all 1:5.2.7-1 stable  ftp.fr.debian.org
No stable-updates version
libreoffice-common:all 1:5.4.1-1 testing ftp.fr.debian.org
No unstable version
No experimental version
libreoffice-common:all 1:5.4.2-1 newer than version in archive
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Why "No unstable version" while

  https://packages.debian.org/sid/libreoffice-common

says "libreoffice-common (1:5.4.2-1)"?

Is this a bug with the mirror?

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Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)