RuntimeCellTransformers can result in increasing the instance count when a BP instance is not destroyed.

The problem is related to the SimpleConstructionScript that executes on the BP instances after the transformer. 

The problem also happens at cook time as the SCS is executed when the package is saved. 

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• Open the attached project
• Run PIE
• The 2 instances of "MartinTest" where not fully transformed because of the difference at their StaticMeshComponent level
• Observe the info on screen
• The PackedActor does contain instances of Cube and the BP Instance do contain the "same"
• Shift-F1 (eject)
• Select one of the MartinTest instances
  • In the details panel, change the Z value for the translation (ex: 200) 
  • Observe that the cube instances are duplicated in the PackedActor and the BP