Steps to reproduce:

Create a new 3D URP project
Install the “com.unity.visualeffectgraph” package from the Package Manager
Go to Assets > Create > Visual Effects > Visual Effect Graph
Click “Create new Visual Effect Graph” and create any graph from the selection
In the Blackboard, click “+” > Category
Replace the category name with a few spaces and press Enter
Observe the Console

Actual results: "Can't change name, '' is not a valid category name." is logged, and the category keeps its previous name

Expected results: The error message shows the entered name or states that the category name cannot be empty, and the category keeps its previous name

Reproducible with versions: 6000.6.7f1, 6000.7.0b6, 7000.0.0a10

Can’t test with versions: 6000.3.27f1, 6000.6.6f1 (Error is new feature ~~UUM-151381~~)

Tested on (OS): Windows 11

Notes:

Additionally, renaming the category to “Attributes” logs "Can't change name, 'Attributes' is not a valid category name." without explaining that “Attributes” is reserved for a built-in section. Other reserved names give the same message: Properties, Output, Custom Attributes, Built-in Attributes

Renaming to an existing category name does give the reason: "Can't change name, category with the same name already exists"