Catalina Keeps Deleting Documents Symbolic Link
I have found a workaround for this that I got from the Dropbox forum. As for many years, I 've been syncing my Desktop using Dropbox. However, because of the new layer of security in Catalina, it deletes the folder. 

Here is a solution that I did it and it is fine for me now. 


  After creating the symlink to my Dropbox desktop folder, I locked the
  link file by displaying its info and checking the 'Locked' checkbox.
  That seems to do the trick. I checked that I can still write and save
  to my desktop.


Link: Dropbox Symlinks