Second player in PIE window does nothing, stays static. Shouldn't he behave normally locally (even if he wasn't replicated)?

I have a project that uses a template from the marketplace. This template does not have replication and I want to start working on replicating it.

But what caught my attention is that when I run the project in the editor and choose 2 clients to run in the PIE window, player one works fine, but player 2 remains static and does not even have idle animations, it does not move, it does nothing.

I understand that even though the project is not replicated, it should run normally in both windows, player 1’s window and player 2’s window, each in its own “location” or am I wrong?

Does anyone have any idea why this happens?

Client Mode, 2 Players, New Windows ?