Here’s a small tweak to the Vanilla exporter script; the script that exports the databases of other forums and Vanilla 1 to Vanilla 2.
With the current official build, the posts that were deleted in Vanilla 1 became undeleted in Vanilla 2, and this fixes it.
I think the tweak will be added to the next official build anyway but until then you can use this.

Download here and, as with before, follow the instructions here.