Do you guys @UElaci @Goraxxius1 have those 9 assets in the Dataprep Editor Content?
Else you will need to perform a “verify” on your installation of UE5.1 and when closing UE after running dataprep import do not save modification on those files. c.f.
more details here Visual Dataprep Viewport Crash - #2 by UE_FlavienP