I've stumbled across what appear to be a bug, if you have an module with content and update the module with new fields in the design manager sometimes the old content and old module fields still render with no way to edit it since the new module replaced it. This means the old content would have to be reentered after I upgrade the module in the code. It doesn't occur with all modules strangly. I know you can change the module ID to create a duplicate within a page but this bug occurs on the same module, same ID just updated fields.
Some links are also rendering funky....it's really wild. Standard link field just renders junk instead of the selected content page.