Both with SDK 7.4.3 and 8.0.0-Beta in the simulator (I don't have a real device, so I can't say about that) vivoactive5 behaves strangely as a datafield in 1 Field layout (look at the left and the top of the screen):
dc.setColor(getBackgroundColor(), getBackgroundColor()); dc.clear(); // vivoactive5: black: OK, white: bug
and:
dc.setColor(getBackgroundColor(), getBackgroundColor()); dc.fillRectangle(0, 0, width, height); // vivoactive5: white: OK, black: bug
Probably related to: https://forums.garmin.com/developer/connect-iq/i/bug-reports/bug-vivoactive5-simulator-json-has-wrong-width-data-for-datafields
