How on earth one thread gets necro’ed when there is a more recent one up is beyond me some days.
There really isn’t a fix, per se. It’s a graphic issue. They’re usually still there and will just reappear at random. Despite other peoples’ “fix” of buying new bags to swap in, they just kind of come back on their own. But please do submit a report on the Bug Report forum so the Devs can make note that it’s an issue.