I feel like when the vent line was ontop of my 2017 it let the air out first before overflowing with water. Seemed to require less burping...but I think the sensor setup on the bottom is for the following reasons:

1) G6 has 2 pumps per bag and you will overflow without it keeping up with a single hose.
2) The sensor needs to detect water....not sure if there is an issue with air pressure too.

Either way a small inconvenience....it would be cool if they had a quick release check valve like Sumo does! - https://www.wakemakers.com/straight-line-link-cap.html