Blueprint based on custom Vehicle class can't be edited after closing/opening the editor

If a custom class named Vehicle is used as the base of a blueprint, closing and reopening the editor prevents the blueprint from being opened. The editor reports that the derived class is invalid.

1. Open UE4Editor (any project)
2. Add code to project based on Actor
3. Name the class "Vehicle"
4. After creating the Vehicle class, create a blueprint based on the class
5. Save everything and close the project
6. Reopen the project and double click on the blueprint to open it.

Fix UE-51650

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