Hello,
Yeah, I find that this always occurs with Blueprint Components and some static meshes. Your Black Adlers happen to be one of those static mesh cases.
Notice how the outline/highlight disappears when you scale back, and reappears as you zoom in, but the mesh, itself, does not.
So, that says “bug” to me. And again, this is a known issue with the Blueprint Components as well. (As in, if you take a static mesh whose draw distance works well alone, but add that static mesh to a Blueprint, it will no longer behave the same way with its assign draw distance.)
Here’s a corroborating thread: