The issue is still present in sid with
xserver-xorg-input-synaptics 1.9.0-1+b1

However, I just found that using the libinput driver makes the touchpad work perfectly.
All I did was:

# mkdir /etc/X11/xorg.conf.d
# cp /usr/share/X11/xorg.conf.d/40-libinput.conf /etc/X11/xorg.conf.d/90-libinput.conf

and restarted X.

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