Black areas around my map

Hello! I’m new at UE, using the 4.26 version. I’m working on a archviz project, external scene, but when i baked the lights, this (Vídeo do WhatsApp de 2022-11-09 à(s) 21.42.31.mp4 - Google Drive) started to happen. I tought it could be just a viewport issue, but when I change the light quality to Production and play the StandAlone Game, it still happens.
A friend told me it could be that it could be caused by raytracing, and recommended me to disable GPU Lightmass. But my CPU is a Ryzen 7 5700x, which means it has no integrated video, so I activated GPU Lightmass to light baking because using the default light building was consuming too much RAM and cpu, and Unreal crashes all the times I tried.
Can anyone help me please?