World partition causes crash during level opening

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Assertion failed: SourceExport.OuterIndex.IsImport() [File:D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerLoad.cpp] [Line: 3537]

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After I converted a level to WP it crashes whenever I load a certain cell where my metahuman is located. I deleted the WP version of the level, navigated to the original one and deleted my character from the level and converted everything to WP again, and only then added the MH blueprint to the level. At first, it worked fine, but after I restarted the level it crashed again.

I might have found an issue, my MH character was under actor generated by the iClone LiveLink addon. After removing it in my original level and re-generating the WP version it works well now.

I got the same question: I Make two same project’s level OFPA,then merge the One OFPA’s result to another result file,then it happen !
I could not open the project with this bug,althrough i do anything……