I’m also seeing similar behaviour. I use the commands “Ghost” and “Slomo 20” to test fast movement.
The world partition streaming is set to blocking.
When I run away from the cells off the map to unload them all then back in to load them again it won’t block the game for any significant amount of time. After that the game will still be running, animations playing, stats updating, but the character will stop moving and the input will completely freeze. I can’t move, can’t open the PIE console, nothing. If I click on the game viewport the input will resume and I will be able to move and input again. This also appears in builds of the game.
I’m doing more research into this to see what’s up. Is anybody else noticing anything similar?