Converting Creative 1.0 Island causing Validation Errors

Summary

After converting a creative 1.0 Island I am getting validation errors regarding scripts and blueprints.
Package /ProjectName/ProjectName references disallowed object /Script/BlueprintGraph.K2Node_Event. (FortValidator_FortExposedAssets)
Package /ProjectName/ProjectName references disallowed object /ScriptEngine.LevelScriptBlueprint. (FortValidator_FortExposedAssets)

Disallowed reference to /Script/Engine.LevelScriptBlueprint, Referenced by: See below for asset list, Plugin: ProjectName.
/ProjectName/ProjectName

When trying to run fix-up I get the message that one object was updated, PersistentLevel.Apollo_FlatGrass_Island_105x015
but after that I continue to get validation errors.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Other

Steps to Reproduce

I have replicated this by reverting my island to 1.0 and trying again multiple times.
create a new UEFN Project using creative map, it tells me that several things will be converted so I accept. After the project opens and the area loads, I try to launch session/validate and get these errors.

Expected Result

I expect to be able to convert the island with no validation errors.

Observed Result

Project references disallowed object /Script.BlueprintGraph.K2Node_Event.

Platform(s)

PC

Island Code

3129-3600-5700

Upload an image

Additional Notes

I had a disallowed Golden Midas Toilet prop but have since deleted it from the island, are there perhaps more unreleased props causing this?