Error validating UEFN island that was converted from Creative 1.0

Summary

After converting some Creative 1.0 islands to UEFN projects, I have encountered some validation issues when trying to launch an edit session.
It has happened to around 8/45 of my maps that I have converted.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Other

Steps to Reproduce

Convert the old Creative 1.0 island to a UEFN island.
Open the island in UEFN and attempt to launch a session.
Unsure what exactly causes the error, as it has happened to 8/45 maps when following these steps.

Expected Result

Should give you a validation error saying “Disallowed reference to /Script/Engine/LevelScriptBlueprint.”

Observed Result

This error has happened on 8/45 attempts.

Platform(s)

PC, PS5

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Additional Notes

All the islands were very similar. There wasn’t anything unique that I could find about the 8 islands that threw that error.