I reported a big bug where on the MacOS client that you'd move files from a folder but if moved from online state to a certain drive that it would just not download but would delete from the Dropbox online location anyway. The fact that it's not mentioned here makes me assume that you still haven't fixed this. It did this if you moved the offline folder to an external disk... Apparently the system would move the file record and then download it later... but apparently there's no guarantee that it would actually download it. A very odd bug that OneDrive doesn't have.
My next month is up for renewal in 4 days, so I guess I need to switch back to OneDrive since they don't have this problem.