A question I answered was closed and presumably automagically migrated to Writers. I lost some rep because the question was no longer on ELU.
It's since been migrated back because it is actually relevant here and not there. But it appears that although rep is lost when a question is migrated away, it's not regained if the question reappears. In fact the system appears to have forgotten me: my account name isn't a link and the Gravatar is the default "deleted user" brown icon.
I guess this has happened because I don't have an account on Writers. Other accounts on that question are still linked following its repatriation.
While losing 103 rep is not going to affect me much, it might have a greater effect on less established members.
Should rep which is removed on migration be restored if the question is returned? Does it really depend on having an account on both sites?