It seems to be broken when starting new project: after going to package manager and installing input system package it displays a message about native input backends required and asks to enable those (and also, that Unity restart will be required).
But Unity doesn't restart after clicking yes and input processing is broken: i can see input beeing fired in the input debugger console, but it doesn't fire events.
Restarting Unity manually does not help as far as i can tell, for the time being im just rebooting the whole system. After reboot it seems to work fine.