Somewhat similar to https://forums.garmin.com/developer/connect-iq/i/bug-reports/bug-vivoactive5-has-bad-screen-position-for-1-field-datafield-layout-in-simulator except that this happens on a real fr965 with FW 21.19 (and it doesn't happen in the sim): My full-screen data field is added to a 1 Field layout, the default setting on the device is black background, and onUpdate starts with:
dc.setColor(Graphics.COLOR_WHITE, Graphics.COLOR_WHITE); dc.clear();
Note that I don't use clipping in my code.
I started an activity and noticed that it's slightly off-center to the left, top. Took this screenshot, note in the right and the bottom an arc is "missing":
Then a minute later, still in the same activity it changed to this (note that now the right is OK, only the bottom is missing):