Alpha 20.4 b42: Mods are now loaded from the, /Mods (i.e. the folder that also stores ses, e.g. on Windows %APPDATA%/7DaysToDie/Mods) in addition to /Mods. In a future build this will change to only load from that new location, so no data is written/changed in the program folder at any time.
Important: Some mods require different installation methods. When installing such mods, consider the instructions of the mod authors.