[lbriner]

You are expecting some change in G-force due to changing to AP, you don't necessarily feel the start of the drop and once descent is consistent, it won't feel that alarming, add to that the fact that you think the AP is correctly set and you have confirmation bias and won't notice anything wrong.

Just goes to show that we still don't really know if we should "trust the plane" or "trust the pilot".

[xaedes]

Regarding who to trust; both: trust the whole cyber-physical system. And like OP said, the system worked as designed. The bigger system now even learns from this and improves the existing cyber-physical system to handle such cases even better / earlier or avoid them: "Flybe implemented remedial actions quickly in response to the incident and our training and procedures have been amended to minimise the risk of a reoccurrence".