Device Simulator Bug with vivoactive 3

Mac OS X, Connect IQ Device Simulator 2.3.1:

When I simulate vivoactive 3 and select "Data Fields" --> "Layout" --> "3 Fields B" or "4 Fields" I get big blue areas inside vivoactive 3 preview.
See attached images.
(Simulated App is "FieldTimerEvents" from examples) community.garmin.com/.../1250254.jpg community.garmin.com/.../1250255.jpg