There is nothing that should be holding the extractor in its open or "extract" position.
The screw in the bottom of the lug prevents the extractor from extending too far, but nothing at all should prevent it from sliding back in to its closed position.
Did the person who did the stock work with the "action still in place" have any reason to remove and disassemble the floor plate?
The cocking slide and associated parts can get screwed up by someone who isn't familiar with their reassembly. (words of personal experience)
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