No need to use via proxy at all. Minosoft supports 1.12.2 natively. You can just enforce that version (cuberite also supports 1.14, you can force that version too).
There is a need as multiple things were broken when I tried both of those methods, ViaProxy is technically not required but having it makes the two work together a lot more nicely. I'm not entirely sure what ViaProxy does differently here but it fixed both the getting stuck in doors issue as well as mobs not rendering
