*Steps to reproduce:*
# Create and open a blackboard asset
# Add a subgraph variable in the blackboard asset
# Create and open a behavior graph
# Add the blackboard asset to the graph
# Add a run subgraph node
# Click on the chain icon on the node to open the pop-up for assigning variables

*Actual results:* The blackboard asset subgraph variable is not listed

*Expected results:* You can see the blackboard asset subgraph variable listed and you can select it and assign it

*Reproducible with versions:* 
1.0.9

*Tested on (OS):* MacOS