Blueprint "Set by ref" (UK2Node_VariableSetRef) does not mark properties dirty for push replication

When using Push Replication with blueprints, UK2Node_VariableSetRef nodes do not mark a property as dirty and so the variable is not replicated.

• Define the following [System Settings] within DefaultEngine.ini -
  • net.IsPushModelEnabled=1
  • net.MakeBpPropertiesPushModel=1
  • net.PushModelSkipUndirtiedReplication=1
  • net.PushModelSkipUndirtiedFastArrays=0
• Create a test actor blueprint and enable replication on the actor. Create a replicated integer property.
• On authority attempt to increment this property using a UK2Node_VariableSetRef node, for example the ++ integer increment node.
• Add an on_rep function that prints this integer when it is replicated on the client.
• You will see that this property is not replicated after incrementing using the ++ node.
• Further Notes: This behaviour is only observed using the Push Model-enabled networking configuration. Using a set node taking in the incremented value after the UK2Node_VariableSetRef node will mark the property as dirty and replicate correctly.