Font weight missing


I have installed a new font family via the Font Manager app. This family is proprietary and has only two types (Regular and Medium - only weight changes).
These fonts are available in Inkscape, etc., but LibreOffice shows only the “Regular” one.

Do you have any clue how I can fix this?

Thanks in advance


PS : it was working with an oldest version of LOffice few days ago…

My configuration :
Build ID: 1:6.0.7-0ubuntu0.18.04.10
CPU threads: 8; OS: Linux 5.4; UI render: default; VCL: gtk3;
Locale: fr-FR (en_US.UTF-8); Calc: group