Steps to reproduce:

Create a new Unity project using the Universal 3D template
Install the Visual Effect Graph package (com.unity.visualeffectgraph)
Create a new Visual Effect Graph (Assets > Create > Visual Effects > Visual Effect Graph)
Open the newly created Visual Effect Graph
Create 3 new Categories by clicking the "+" button in the Blackboard
Rename the first Category (top of the list)
Observe the Blackboard
Save the Visual Effect Graph
Repeat step 7

Actual results: RenameCategory removes and re-appends the entry, so the stored order changes. The blackboard keeps the old position until the graph is reopened, then the category jumps to the end.

Expected results: The Category should instantly jump to the end or it should not be reordered at all

Reproducible with versions: 6000.0.0f1, 6000.0.83f1, 6000.3.24f1, 6000.5.11f1, 6000.6.1f1, 6000.7.0a6

Tested on (OS): MacOS Silicon Tahoe 26.6.2, Ubuntu 24.04

Notes:

For versions 6000.0.0f1, 6000.0.83f1, 6000.3.24f1, 6000.5.11f1, saving the Graph is not enough, it needs to be reopened to see the reorder
This is very inconvenient when managing bigger Graphs, especially in streams 6000.5 and below as reopening the Visual Effect Graph completely changes the Blackboard