Touchpad two-finger scroll triggers middleclick

Help
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Hi Mates,

I’ve a really wired behavior after update to plasma 6 and wayland:

When I do a two-finger scroll on my Lenovo touchpad it triggers randomly middleclick (paste text). In some applications like Brave or WebStorm.
It does not happen in KDE apps like Konsole or Kate.

I use libinput.

Any ideas how to track the issue down?
Thx. It’s really annoying.