When you have selected multiple VFX assets and make changes to them, when you try to undo these changes there is no indication it's working until all changes have been undone.
At this point, suddenly all your changes appear undone.

1. Create a new project.
2. Install the Visual Effect Graph package. (Window -> Package Manager)
3. Create a new VFX asset. (Assets -> Create -> Visual Effects -> Visual Effect Graph)
4. Open this asset to display in the node editor.
5. On the Blackboard in the node editor, click '+' and add a new Texture2D, Vector3D and Gradient. (Or any other parameters you wish.)
6. Set these three parameters to 'Exposed'.
7. Return to the Editor and pull this VFX asset into the scene/hierarchy twice.
8. Multi-select these two assets in the hierarchy.
9. In the inspector, edit the exposed parameters to random values.
10. Press Ctrl+Z until the changes are undone.

Expected Outcome: With each undo, the action should visibly undo the last change in the inspector.
Actual Outcome: It looks like nothing is happening with each undo, and suddenly all changes are undone.

NOTE:
- If you redo all the undone changes, it looks like you have not gotten those changes back no matter how many times you redo until you change the selection to just one of the assets.
- There is no problem when only one asset is selected.

GIF demonstrating this attached to case.

Reproducible in package version 7.1.2, 7.0.1, 6.9.1, 6.9.0
Not Reproducible in package version 4.3.0, 4.10.0, 6.7.1