I have a Bug Only can be recurrented by"Debug_game"Mode

i use UE 4.21
I want put an actor on the air, so I use SetWorldLocation.It works well on most of time,but sometime SetWorldLocation will make the location.z to 0.0(i set z to 4700)

this bug only can recurrented by "Debug_game"Mode,when i use "Debug_editor"Mode,there is nothing wrong!