When switching layers, the outer stroke FX displays an issue.
When I drag a layer with an outer stroke FX outside the canvas view of the software and then drag it back, it displays normally again.
So I suspect there might be a rendering bug somewhere—please check it.
It is most likely triggered when the color picker samples a transparent channel color (for example, an empty area on the canvas).
You can try zooming in to a sufficient size and then pick a color from an area of the image that has color. This will refresh the display of the outer stroke.
This is the current workaround solution.
