Steps to reproduce: generate a first notification with “notify-send a”, then run while it's still there the following Python 3 script in a terminal:
from gi.repository import Notify, Gtk
def callback(*args): print("Callback called")
notification = Notify.Notification.new("Test", "Test2")
notification.add_action("my action", "Call", callback)
Put your mouse over this second notification and wait for the first to disappear. When clicking on the button, the callback won't be called.
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