I'm now leaning on one of the pilots having a brain fart and shutting down the engines. Probably the Captain with 18,000 hours, so used to flying that he no longer has to think every action fully through. He thought "gear up" believes he did "gear up" but due to a brain fart, his arm did "engine shutdown"
As I believe that the pilots in the cockpit should always have absolute authority to be able to fly to the plane how they want, without the risk of "computer says no" I don't think there is a fix, just an acceptable risk.
I thought it was all going to be AI and push a button to take off.. (If you can imagine the BOFH AI Grok4 doing that)