When Copying/Pasting a hole-making operation, in certain circumstances, the direction of holes may be incorrectly flipped.
Solution
This may be worked around by manually flipping the hole direction in the copied operation
The problem is resolved in NX 1859 - April 2019 Monthly Update (NX 1847 Series).
Notes and References
Hardware/Software Configuration
Platform: INTL64
OS: window
OS Version: 1064
Product: NX
Application: CAM
Version: V1847
Function: HOLE_BOSS_MILL
Ref: 001-9476710