After creating an FBX model for my game in Blender, I generated a UV texture (lightmap pack) using this method (through baking) and inserted it into the mesh.
I exported both the mesh and the texture and put them in game.
It looked fine at first… but when I inspected the model closely, I found these weird blurry thingies.
But there isn’t anything like that on the texture:
And it looks fine in Blender