can't use finger to drag window via titlebar on x11/xcb

It's a 2 in 1 laptop, Ubuntu 23.10, latest qtbase dev, system info like lsusb-output.txt and xinput-output.txt .

TouchScreen: Weida Hi-Tech Co., Ltd. CoolTouch System
Stylus: WCOM0104:00 2D1F:0101 Stylus Pen

When I try any Qt example with title bar, trying to drag title bar to move the window, the Wacom pen works fine, but not the finger.

I tried to print out the debug info from x11/xcb events, for the pen, we can get XCB_CONFIGURE_NOTIFY, but not for the finger.