Strange Reflection in UE5

Yes, I’ve already built the HLOD, and I also replaced the rock model, making sure that it correctly generates reflections. However, the issue still persisted. In the end, I adjusted the material’s roughness to 0, and that seemed to fix it!
image

But since I’m not too familiar with rendering, In your opinion, was it the right move to set the roughness to 0 in this situation?