With ResetForm-action support added in PR 14083, there's a regression in the `issue12716` test-case. More specifically the border around the "Clear Form"-link is now rendered *twice*, once in the canvas via the appearance-stream and once in the annotationLayer via the border-data.
This looks slightly weird, and was most likely not intended, which is why this patch suggests that we ignore the border in the annotationLayer when an appearance-stream exists.