We're having issues with hosting a server on a player's device. When the player hosting the server joins, it appears to reset the entire world (population, vehicles, environment) besides from the areas that are already loaded by the presence other players already on the server. I've observed that the size of the world save folder ...\Saves\Multiplayer\servertest decreases significantly from immediately before to immediately after the host has joined.
To be sure the mods we're using aren't the issue, I ran the server with no mods applied and the issue persisted. I've attached both server console logs, the larger one being that in which the mods were applied.
server-console.txt
server-console.txt