I was recently contacted by a journal editor where they effectively requested that I update my citation database. They said that they came across one of my pre-prints where I reference another pre-print, which has since been published in their journal:
I was interested to see your article [some title] on [pre-print server]. In particular I noticed that you cite another article on [same pre-print server] that has recently been published in [journal that they are editor of].
I wondered if you would be able to update your future reference lists to include these citation details in the published version where relevant.
While I'm happy to do so, this seems an odd request to make. It also seems like an issue that would sort itself out (i.e. if I were to cite the article again, I would naturally double-check for correctness and in the process see the published version and update the reference anyway).
Thus my question is: Is this common? How should I respond to this? While the email could conceivably have been generated by an automated script, it appears to have the human touch and be genuine.