Page orientation “Vertical”: enter notes with mouse fails from a page > 1

Nightly e842ec0/ Windows 7

1) « My First Score » → append 80 measures, or load this file : test vertical.mscz

2) Edit → Preferences → Canvas → Page Orientation : tick« Vertical » → Ok

3) Note input mode : in the first page, enter some notes alternately with the keyboard and the mouse

Result : works as expected

4) Repeat step #3, but in page 2 or/and following(s) :

Result : the notes input works with keyboard, but fails with mouse : nothing happens (not blue "shadow" note)