When the main Renoise window has focus, mousing over a dialog window will not display the tooltips, even though the dialog receives the mouse event (you can tell, as buttons are highlighted). I found that it’s the case not only with scripted dialogs, but also native ones like the MIDI mapping dialog
even good if the effect commands are alway displayed at the bottom left corner, when the cursor is over on a command, not just when i write the number!