Landscape tool does not work correctly in OSX 10.12

The landscape tool is not working correctly in OSX Sierra 10.12

This could not be reproduced in El Capitan 10.11.6 on a similar iMac or on Windows

Not a regression as it occurs in 4.13.2 as well

1. Open any project in the editor on Mac 10.12
2. Select Landscape mode and create a landscape
3. Left click on the landscape to raise the elevation

Result: Landscape glitching occurs

[UE-23848] Bug Status

Fix UE-51650

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