We found a bug with texture streaming when world origin rebasing is enabled. The engine could not determine the correct mip map level of a texture if the level is large and world origin is shiftet.
I was able to reproduce it in a test project.
To reproduce it you have to package the game as Win64 and start it. You can see the “Unreal Engine” Text in a low resolution. If you open “stat streaming” you can see “Visible Mips” with around 5MB but it should be around 25MB.
I’ve tried it with 4.16.3 too. There the same bug occurs.