Currently, when changing the Property of a Path (eg: 'Fill'):

Outside of a Storyboard: every sibling Path will also be momentarily changed alongside the selected Path
Inside of a Storyboard: every sibling Path will also be permanently changed alongside the selected Path.

In addition, it also appears that changes made inside of a Storyboard become lost by the Undo Stack.

See attached video.

Repro Steps:

1) Download the attached 'Reticle.svg'.
2) Create a Studio Project containing a MainPage.xaml
3) Import the Reticle SVG file into the Root Grid of the Page.
4) Expand the Reticle's Canvas Element to reveal all of its Paths.
5) Select any single Path, and change its Fill colour to any colour of your choice.

Observe how all Paths momentarily change colour, before only being applied to the selected Path.

6) Navigate to the Animation/Storyboards Panel, and create a new Storyboard.
This will set the Storyboard to be in 'Recording Mode'.

7) With the Storyboard's Timeline open, select any single Path of the imported vectors, and change its Fill colour to any colour of your choice.

Observe how all Paths are recoloured instead of just the selected one.

8) Press Ctrl+Z repeatedly to go back in the Undo stack.

Observe how the applied colours don't undo at the moment in the Undo Stack they'd be expected to.

Expected Results: Only the Properties of the selected Path are changed in all circumstances.
Expected Results: Path Property changes are accounted for in the Undo/Redo Stack at the moment in the Stack they were changed.