Just a heads up: I’m having some issues with Cinnamon DE as well.
For me it’s mainly that all display settings for multiple monitors are forgotten/reset to default. That means that monitor layout and orientation is off. Also the setting for which monitor is primary is gone.
Additionally, the Display settings dialog is no longer in the Start menu by itself. You have to open it through the general System Settings app.
So, this is all easily fixable, but annoying nonetheless. During a month I will easily connect my laptop to two dozen work/meeting room setups and all those display settings were handily remembered and automatically applied, so now I will face a couple of months of going into the display settings everytime I use a new desk or meeting room.