Why when I use “Is falling” it trace my character when move +z and -z ? Is falling must to trace only -z .
This is expected behavior and is the default way the engine handles jumping.
There is multiple ways you can set this up depending on how your jump function is handled. One way is to run a check on the velocity of the character movement component. The Tick node is for testing purposes; I suggest using a Timer or Timeline in an actual game.