drop-down terminal under gtk3 always displays on primary monitor

Since version 4.16, the terminal dropdown is always shown on the primary monitor i.e. monitor 0.

The function responsible for showing the dropdown is: https://gitlab.xfce.org/apps/xfce4-terminal/-/blob/6f4b8b0f4939734e3947a485cd188caf048bfbba/terminal/terminal-window-dropdown.c#L746

It looks like it calls a function from libxfce4ui in order to get the monitor and this monitor is always set to 0 (i.e. primary): https://gitlab.xfce.org/xfce/libxfce4ui/-/blob/b48db481750422c033cc2e0d6460e71f8383939a/libxfce4ui/xfce-gdk-extensions.c#L61

Is this the new direction for the drop-down?

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Also reported here: xfce/libxfce4ui#34 (closed)