I just received a recall notice from Dometic for my CFX3 cooler (I know there are some others out there that may not be registered). It seems there is a fire issue if they are plugged in to both 12 VDC and 120 VAC at the same time. Here is a link to the Dometic web page with details of the involved freestanding coolers:
CFX3 Recall | Dometic
2019 320 Boondock Edge - Sold Jan 2022
Comments
2018 320S Outback
Reading further through the documentation that was sent says the issue is the AC could send 28VDC back through the 12VDC circuit. This could damage other 12V devices in the trailer, RV, boat, etc. and lead to a fire.
The "Fix" is a sticker to attach next to the power input ports saying not to be plugged in to both power sources at the same time...
2019 320 Boondock Edge - Sold Jan 2022