hot reloading not working anymore

Hi there,
I used this fantastic hot reloading feature one year ago in my last project and it worked like a charm. Now, with current versions, I cannot get it running anymore. My setup:

  • expo-cli 3.0.10 on an Ubuntu 18.4 machine
  • Expo client app on an iPhone SE (physical device)
  • ‘tabs’ example expo project using SDK 34

When I change a file there just happens nothing. Live reloading works btw, when I save a change the whole app reloads, but that’s not really what I want.
Any ideas?