Text on node flickers when moving the node if it is referencing a blackboard asset variable

Steps to reproduce:

1. Create and open a blackboard asset (Assets > Create > Behavior > Blackboard)
2. Add a GameObject variable
3. Create and open a behavior graph (Assets > Create > Behavior > Behavior Graph)
4. Add the blackboard asset to the behavior graph
5. Add a 'Set Variable Value' node
6. Set the first field to 'Self'
7. Set the second field to the blackboard asset variable
8. Move the node around

Actual results: The text of the second field flickers between 'New GameObject' and 'Blackboard -> New GameObject'

Expected results: The text stays as 'Blackboard -> New GameObject'

Reproducible with versions: 
1.0.9
1.0.7

Not reproducible with versions: 
1.0.6

Tested on (OS): MacOS