i3wm doesn't move Inkscape to workspace assigned

suddenly, i3 stopped moving Inkscape to the workspace I assigned to it. I really cannot understand why it is doing this, because it was just working fine like two days ago. I'll post the code I wrote in i3/config to move Inkscape to the ninth workspace and to move me as well to that workspace: for_window [class="Inkscape"] move to workspace $ws9 workspace number $ws9 Moreover, this is the output of xprop used on the Inkscape window: WM_CLASS(STRING) = "org.inkscape.Inkscape", "Inkscape" If you need anything else, let me know. (I checked that the name of the workspace is actually $ws9) One thing I noticed is that it doesn't move only when I open it in workspaces where I have other windows; if it is in an empty workspace, it will be moved to the ninth one.