Found this bug on my server. Some time after starting the server players stop seeing all 3D objects (cars, machines, decorative objects). This bug was also seen in the single player game.

Does your server automatically kill entities?

If it does, see if you can add a whitelist option for the mts rendering entity? (I don't remember the name, but you'll see it if you type "/summon mts:" and press tab.)

MTS uses a tiny "mob" that spawns in front of the player's view in order to force-render some things (because otherwise they'd stop rendering at higher speeds, or above Y256)

Duplicate of #893 .