Copter used wrong EKF Failsafe

Hello,
We had a copter lose gps signal and land in the middle of a forest eventhough we had set FS_EKF_ACTION = 2
Using a Hex Blue Cube in the setup and Arducopter 3.6.12
Any idea why this would happen?
I posted this on the Ardupilot forums, but posting it here also if anyone knows why this happened.

https://drive.google.com/file/d/1jllY_nTLrrqCv2iMMa53JX-1APE7bIQg/view?usp=sharing