Uh just too late :( This still breaks three/four finger gestures for me (Thinkpad t460p), just like 1.15.1. Downgrading to 1.15.0 fixes the issue.

Every time (but the very first time in a session) I get the following output in the journal when trying e.g. a three finger swipe:

libinput error: event4  - SynPS/2 Synaptics TouchPad: kernel bug: touch 1 ended and began in in same frame.

This update breaks three and five finger swipes for me. Each time I try I get the following message in the log:

gnome-shell[7012]: libinput error: event4  - SynPS/2 Synaptics TouchPad: kernel bug: touch 1 ended and began in in same frame.

Device info:

I: Bus=0011 Vendor=0002 Product=0007 Version=01b1
N: Name="SynPS/2 Synaptics TouchPad"
P: Phys=isa0060/serio1/input0
S: Sysfs=/devices/platform/i8042/serio1/input/input5
U: Uniq=
H: Handlers=mouse0 event4 
B: PROP=5
B: EV=b
B: KEY=e520 10000 0 0 0 0
B: ABS=660800011000003