If you make a Blueprint child of StaticMeshActor, and set the default scale of the Root Component (Static Mesh Component) to something other than 1,1,1, the scale will not be applied when the actor is placed with Surface Snapping (but the scale is applied correctly if you place it without surface snapping on).
Result: The Static Mesh will have default 1,1,1 scale.
Expected: The Static Mesh should have 10,10,10 scale.
Special Notes:
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-82188 in the post.