Hello jalte,
So have you added a sphere reflection capture to your scene at all?
I just ran your test using the steps you provided and was able to see the issue on my end, but upon further investigation if I added a Sphere Reflection Capture to the level, the issue was very minimal and hardly noticeable.
Have you tried adding a Skylight to your level with a custom cubemap as well?
Let me know if you have further questions.
Cheers,