Listener for Fetch.requestPaused not working

[oculunto]

Hello,
I have troubles making driver.add_cdp_listener work with Fetch.requestPaused.
I use
driver.execute_cdp_cmd('Fetch.enable', {'patterns':[{'urlPattern':'*'}]})
and then
browser.add_cdp_listener("Fetch.requestPaused", lambda data: on_request(data))
But it never goes to on_request

On the other hand, Network.requestWillBeSent works as expected.

Does anybody know how to make it work?