Weston is not receiving touch input (regarding touch input as mouse input)

I connected my computer with a touchscreen. My GNOME applications handles the touch events expectedly except Weston, which regards my touch input as mouse input. I tested touch using weston-simple-touch, but nothing is drawn on the interface if I use touchscreen to touch on it.

• OS Name: Ubuntu 20.04.4 LTS
• GNOME version: 3.36.8
• Windowing System: X11
• Weston version: 8.0.0
• cat ~/.config/weston.ini:

[core]
idle-time=0
require-input=false
xwayland=true

[libinput]
touchscreen_calibrator=true
calibration_helper=/usr/bin/save-calibration.sh
enable-tap=true
tap-and-drag=true
tap-and-drag-lock=true

[shell]
binding-modifier=ctrl
panel-position=none
locking=false
animation=none
close-animation=none
startup-animation=none
auto-zap=true

[terminal]
font=JetBrains Mono

• xinput (the device with id=24 is my touchscreen input device):

⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
⎜   ↳ MSFT0001:00 06CB:CE2D Mouse             	id=28	[slave  pointer  (2)]
⎜   ↳ MSFT0001:00 06CB:CE2D Touchpad          	id=29	[slave  pointer  (2)]
⎜   ↳ SEMICO USB Keyboard Consumer Control    	id=11	[slave  pointer  (2)]
⎜   ↳ Wacom Intuos P M 2 Pen stylus           	id=25	[slave  pointer  (2)]
⎜   ↳ deltainno Smartisan TNT go Touchpad     	id=21	[slave  pointer  (2)]
⎜   ↳ Wacom Intuos P M 2 Pad pad              	id=26	[slave  pointer  (2)]
⎜   ↳ ITE Tech. Inc. ITE Device(8910) Keyboard	id=17	[slave  pointer  (2)]
⎜   ↳ USB OPTICAL MOUSE                       	id=14	[slave  pointer  (2)]
⎜   ↳ deltainno Smartisan TNT go              	id=24	[slave  pointer  (2)]
⎜   ↳ deltainno Smartisan TNT go Keyboard     	id=20	[slave  pointer  (2)]
⎜   ↳ deltainno Smartisan TNT go Mouse        	id=23	[slave  pointer  (2)]
⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
    ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
    ↳ Ideapad extra buttons                   	id=27	[slave  keyboard (3)]
    ↳ Video Bus                               	id=7	[slave  keyboard (3)]
    ↳ deltainno Smartisan TNT go Wireless Radio Control	id=22	[slave  keyboard (3)]
    ↳ SEMICO USB Keyboard Consumer Control    	id=31	[slave  keyboard (3)]
    ↳ SEMICO USB Keyboard                     	id=10	[slave  keyboard (3)]
    ↳ SEMICO USB Keyboard System Control      	id=12	[slave  keyboard (3)]
    ↳ SEMICO USB Keyboard                     	id=13	[slave  keyboard (3)]
    ↳ Power Button                            	id=9	[slave  keyboard (3)]
    ↳ ITE Tech. Inc. ITE Device(8910) Wireless Radio Control	id=18	[slave  keyboard (3)]
    ↳ ITE Tech. Inc. ITE Device(8910) Keyboard	id=32	[slave  keyboard (3)]
    ↳ Video Bus                               	id=8	[slave  keyboard (3)]
    ↳ Power Button                            	id=6	[slave  keyboard (3)]
    ↳ ICT Camera: ICT Camera                  	id=19	[slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard            	id=30	[slave  keyboard (3)]
    ↳ Integrated Camera: Integrated C         	id=16	[slave  keyboard (3)]
    ↳ Generic USB Condenser Microphone        	id=15	[slave  keyboard (3)]
    ↳ deltainno Smartisan TNT go Keyboard     	id=33	[slave  keyboard (3)]