notify-send notifications pile up in the Gnome 3 notification tray

notify-send notifications pile up in the Gnome 3 notification tray: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). I'm using Guard with the :notifysend notifier on a Linux box running Gnome 3. Every time a guard plugin fires (test run finishes, etc.) Guard pops up…