I downloaded the Travlenet mod for Minetest (https://content.minetest.net/packages/Sokomine/travelnet/). The problem is that sometimes I work in Singleplayer, and later I host the game. The problem is that the travelnet boxes that I placed in multiplayer are not connected to the travelnet boxes placed in singleplayer. Thus I can't travel between them. How do I fix this?