Is it possible that the extractor rod has come part way unscrewed?

Did you try to force it closed a bit when the pin was jammed under extractor? Might have bend extractor rod a bit.

It isn't hard to reinstall the little extractor pin so it won't come out. I use a small punch to put a little peen near the ent that goes in cylinder and then tap it back it. The peen tightens it up. Some simply clean it and thecylinder up well and use lock tight when reinstalling.