概要
Editor: Fix issue where duplicating GameObjects could slightly alter the Transform values (typically scale) due to floating point precision issues caused by temporarily reparenting as part of the duplication code. (912111)
ゲームオブジェクトを複製した時にスケール値に誤差が発生する現象が
Unity 2018.3.3 で直った?(リリースノートより)