This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.
When renaming a blackboard key using the Entry Name box in the key's details panel, the names of the references in the behavior tree are not updated automatically.
This is inconsistent behavior because right-clicking and selecting rename, as well as left-clicking and editing the key name automatically update the reference.
Clicking the dropdown and re-selecting the key updates the reference.
1. Open the editor
2. Create a new blackboard
3. Add a Vector Key (TargetLocation)
4. Create a new behavior tree
5. Ensure that it is linked to the blackboard (Blackboard Asset dropdown located in the behavior tree's details panel)
6. Add a Selector
7. Add a Move To node
8. Set your Move To Blackboard Key dropdown to your Vector Key (TargetLocation)
9. Open the blackboard
10. Select the Target Location key and edit the Entry Name in the details panel
11. Open the behavior tree
Result: Notice that the Move To node now has Invalid where the key name used to be.
Expected: The key name would be automatically updated.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-30913 in the post.