NodeRegistry invalid generic type warning when changing a Blackboard variable to VectorInt type

Steps to reproduce:

1. Create a node.
2. Create or add manually a Blackboard variable type (any type).
3. Edit the variable type to a VectorInt type (VectorInt2, VectorInt3).
4. A warning is logged in console, warning the user of an invalid generic type used as BlackboardVariable type.
5. Using the variable still works, despite the confusing warning.

Actual results: 

The following warning is logged in the console:

Invalid generic type for field TestVariable of type UnityEngine.Vector2Int on TestAction. BlackboardVariable types must derive from UnityEngine.Object.
UnityEngine.Debug:LogWarning (object)
Unity.Behavior.NodeRegistry:GetNodeVariables (System.Type) (at /com.unity.ai.designer-monorepo/Packages/com.unity.behavior/Authoring/UI/NodeRegistry.cs:304) 

Expected results: 

User should not get warned by using a type on their BlackboardVariable that we're supporting.

Reproducible with versions: 
1.0.3

Not reproducible with versions: 
1.0.2

Tested on (OS): 

Notes:

• Reported by a user here: https://discussions.unity.com/t/behavior-package-1-0-7-released-changelog-inside/1573165/35
• Can get a 100% repro by manually adding a VectorInt type to a custom node.