Scale, rotating, or translating Foliage causes the Foliage to flicker and become invisible when placed. Making several adjustments then undoing the last change causes the foliage to reappear with the previous changes intact.
Changes are reflected on the foliage and the foliage remains visible
Foliage flickers, and when released becomes invisible BUT the changes are saved
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-143618 in the post.