OK I've finally directly found the project page, so I reported it there
https://gitlab.gnome.org/GNOME/network-manager-applet/issues/90
** Bug watch added: gitlab.gnome.org/GNOME/network-manager-applet/issues #90
https://gitlab.gnome.org/GNOME/network-manager-applet/issues/90
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Thank you for your bug report, could you also report it upstream?
** Changed in: network-manager-applet (Ubuntu)
Importance: Undecided => Low
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https://bugs.launchpad.net/bugs/1865363