I have just got a Venu 2 Plus to replace a Vivoactive 3
The Venu 2 Plus is running FW 13.14
I have set the display to 'Timeout-Always On' and 'Gesture-Off' in both 'Not During Activity' and 'During Activity'. On the Vivoactive, this meant that the screen only woke up from the always on display when it was touched, but the Venu screen wakes up with vigorous exercise.
This happens with any built in or custom watch face. The watch has been reset, and powered off/on to try and clear the issue.