Whenever I add the documents or desktop folder to favorites on macOS Sierra, it stays there for some time but then disappears. Is it a problem with iCloud Drive?
Update: It still occurs in macOS High Sierra. I tried booting into safe mode, resetting PRAM and SMC, resetting finder preferences, but it still doesn't fix the problem.
You can see it here: https://youtu.be/TJubgY3tUKM