Basic content : "play" freezes when the first-person actor falls ?

UE4.25 : If I take the “first person” base content, remove the walls, “play” and walk out the platform, at some point (Z ~ -1040) it freezes and I have no idea why.

In the world settings you can specify the height of Kill z. im pretty sure this is what you’re running into - or falling i guess

Thank you.