Biome mods don't work through the auto download anymore. A player joins a lobby with modded biuome active then crashes. Before we used the "companions" line, and that allowed a player without the mod to join the lobby and load the modded biome without problem, now it seems a player is joining and trying to load the map before the mod can be mounted and immediately crashing. UBER....CAN....YOU....FIX....IT???
It’s a fundamental and longstanding issue with the concept of having planets load before mods load. It would be lovely to have a proper fix, as companion mods wasn’t a very good way of doing it anyway.