Graph Toolkit's Variable becomes unfocused when its Flow Direction is changed and a Node was added to the Canvas

How to reproduce:
1. Create a new Unity project and import the "Graph" Script and "Test" Graph
2. Open the "Test" Graph
3. In the Blackboard, select the "New Variable"
4. In the Graph Inspector, change the "Flow Direction" and observe the results

Expected results: The Variable doesn't become unfocused
Actual results: The Variable becomes unfocused

Reproducible with: 6000.4.0b7, 6000.5.0a6

Reproducible on: macOS Tahoe 26 (M1)
Not reproducible on: No other environment tested

Note: Reproducible only if the Placemat wasn't unfocused after creation