Unable to right-click properties in Details panel

REGRESSION: Yes, does not occur in 4.17.

User is not able to summon copy/paste options by right-clicking on a property in the Details panel.

Reproduced this in Level Editor and Blueprint Editor.

This still occurred with -nihighdpi

1. Open QAGame in editor.
2. Select the Floor mesh in the level.
3. In the Details panel, right-click any of the properties (Location, Rotation, Scale, Static Mesh, etc).

RESULT

Copy/Paste options do not appear.