[MM3-users] Moderation Action Changed After Import

I migrated a Mailman 2 list using import21 and the list's config.pck into a Mailman 3 list. The list owner reported back that about 98% of the list members had their moderation setting changed to Reject (with notification). He said the previous moderation was the list's default which was hold for moderation. Is such a thing possible with an import job? Is this perhaps a bug that has been reported previously?

-- Brian Carpenter Harmonylists.com Emwd.com