Repro Steps:

1) Create a Page
2) Introduce a first Rectangle into the RootGrid of the Page. give it a generous Thickness, then convert it to a Path through its context menu by navigating to 'Path', and then selecting 'Convert to Path'.
3) Introduce a second Rectangle into the RootGrid of the Page, give it a generous Thickness, then position it so that it is overlapping in some capacity with the Rectangle in Step 2). Then, also convert this second Rectangle to a Path.

Observe the visual appearance of each Path.

4) Select both rectangular Paths, and right-click on either one of them, and from the context menu, navigate to 'Paths', then select 'Create clipping path'.

Observe the visual appearance of the clipped Paths together.

5) Select the clipped Path, and right-click on it, and from the context menu, navigate to 'Paths', then select 'Release clipping path'.

Observe how one of the Paths has lost its Thickness (Custom Appearance Lost), and has lost its Fill (Default Appearance Lost)

Expected Results: Unclipped Paths retain the visual properties of either: prior to when they were set as clipping, OR unclipped Paths retain the visual properties of their clip-partner Path, OR unclipped Paths are reset to the 'default' appearance of the element.