Hi,
First off, please note that the plugin is not claimed to be ADA nor WCAG compliant. We are regularly testing with the wawe tool, but other tools might be different.
I believe these two finds are simply false positives, as the items are actually invisible, and therefore should be unfocusable with any ADA compliant reader. I don’t know if we can do anything about them, since they are already invisible (set via the stylesheets), and they are marked with the aria-hidden tag as well.