I am really sorry I missed completely that this bug is exactly the same as https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1077256.
I really thought I checked the list seriously before reporting, but I guess was too tired or not careful enough. Just in case I also report it upstream, because at first I thought it was an upstream one : https://github.com/sympa-community/sympa/issues/1964 -- Bruno BEAUFILS Soutenir la SIF : https://soutenir.socinfo.fr
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