Bug on rendering whit split screen ?

I had to use C++ to split the viewport in 9 different “windows” each windows has a player and player controller.

The thing is that the last viewport (windows) doesn’t render some static meshes and doesn’t even renders the “Draw Debug” from a Sphere Trace for Objects

Anyone may have a clue why this is happening ? not rendering the sphere is no problem, the thing is that it doesn’t render some static meshes neither

no clue ?

I have the opposite problem. My 4 viewports do render Draw Debug objects, but not the scene.