I noticed there is not a simple warning box when you are selling an item that is marked favourite or equipped. While your equipped items are always listed last and therefor it’s easy to just stop selling of items in time, that is not the case for items marked as favourite but not equipped
Now you could say that I just should pay attention when you are emptying your bags at a vendor machine, and you;re right about that. It’s just something you would expect as other games have a similar feature.
Put this in the suggestion box.