A quick workaround. Install synaptics and reboot
sudo apt install xserver-xorg-input-synaptics
then
synclient VertScrollDelta=-111
Autoload the configuration
Add a file 20-natural-scrolling-touchpads.conf under /usr/share/X11/xorg.conf.d
with the following content
Section "InputClass" Identifier "Natural Scrolling Touchpads" MatchIsTouchpad "on" MatchDevicePath "/dev/input/event*" Option "VertScrollDelta" "-111" Option "HorizScrollDelta" "-111" EndSection