Weird Lightmaps when Importing FBX from Blender

Hi! I’ve been trying for days to import a simple ring shape in Unreal and I keep getting weird looking Lighmaps. I looked up that topic and it seems I’m not the only one with that problem and no one has found a solution that works for me.

Here’s what it looks like in Blender and Unreal:

I tried:
Tweaking the angle in auto-smooth
Packing lightmaps with different values
Exporting with smoothing set to Face, Edge
Using my own Lightmap and generating a new one
Changing the lightmap resolution

Any advice?

Thanks in advance!