RebuildRenderData is still not safe during cook time

https://answers.unrealengine.com/questions/215370/some-sprites-tiling-into-tiny-grid-in-packaged-ver.html

UTexture2D::ConditionalPostLoad doesn't wait for the render data to finish caching outside of the editor...

The RebuildRenderData is only getting called because the texture size is 0 in the first place, and it then mucks everything up using the fallback 1x1

Some sprites tiling into tiny grid in packaged version only

Why aimoffset with base pose causes arms glitch