Yeah, it’s pretty obscure. For some reason, a process that looks for media-playback plug-ins is looking into an area meant for smart-card authorization. You probably aren’t using that, and in any case this should be harmless. I’ve pointed out your case in the bug report you found, and hopefully this will be resolved soon.
In the meantime, you can:
ignore it
or, if it’s really annoying and you don’t mind trying some things…
probably mitigate this particular problem by removing pcscd, which few end-users need.
Yes, occasionally I use a cardreader to login on government websites or to sign .pdf documents (works in LibreOffice Draw), after doing these social obligations I disconnect the USB-cardreader.