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Freezes client character in multiplayer

When the client connects to the server, the pawn that is created for him freezes and the client does not own the character.
The server sees the client’s character frozen.
In doing so, it can interact with the user interface.
If you minimize the client window (alt + tab), then the freeze disappears.

is the server spawning the character? Or do you have a default pawn and setting auto input on a player start?

Yes, the server spawn the character. It seems that , the freez arises when assigning a character by the Posses node.
So far, I solved the problem with a delay of 0.01 seconds. (SpawnActor> delay (0.01)> Posses)
But I did not understand why such a bug.