Just looked in the Bentley manual, and it shows the detail of the lock mechanism.
On page 57-8 it shows the spring inserted into the hook and has the warning:
"Caution-- Spring must be engaged in spring hook before installing door lock. Failure to do so can result in lock and alarm malfunction."
Further down the page it states:
"NOTE-- Guide spring is released the first time the handle is used. An initial increase in effort to operate the door handle is normal."
So, you are right. It pops out when you operate the door handle.
I just learned something!
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