Fix incorrect continuation in ImportAsUpdate
causing UI blockage
#28818
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Noticed in #28800 (comment).
I have no idea why this was set this way, doesn't make much sense 🙈
de079e0 doesn't really give any clues about why/what was wrong, but i'm inclined to think that whatever made it "wrong" has been fixed either since that commit, or with the very simple change I made in this PR to avoid cross-thread realm access.