Hey unrealengine123,
Take a look at your scene capture cube’s ‘Show Flags’ to enable or disable what the camera actor renders to the texture cube. These can be found by clicking on the Scene Capture Cube actor and looking within the details panel.
Scene Capture Cube - Show Flags - Max View Distance
Also take a look at the Max View Distance Override. This setting will also play a role in your specific set up.
Cheers,