Describe the bug
Hi,
When I and two friends build our railroad system and were ready to drive the weird thing happened when we used trains.
If I or my friend got into a train and started it up we didnt see any effects. After rejoining he saw effects and heared sound but didnt see me drive.

How to reproduce
Steps to reproduce the unwanted behavior:

1. Host a server
2. Get a friend on it
3. start up the train and drive around

Expected behavior
Well I guess seeing the others drive in trains.

System Information
OS: Windows

System Memory: "16gb"

Allocated Memory: "7gb"

CPU: "Ryzen 7 3700x"

GPU: "GTX 1060 3gb"

IR-Version: "1.16.4_1.8.0.1"

Forge-Version: "1.16.4 - 35.1.36"

Modlist
Chisel & Bits
CTM
Dynamic Surroundings
Immersive Engineering
Immersive Railroading
JEI
MrCrayfishs Furniture Mod MrCrayfishs Gun Mod
Obfuscate
Simple Planes
Small Ships
Track API
Universal Mod Core

latest.log
2021-10-06-7.log

Additional context
We are using Optifine with shaders maybe that can be a clue.

Please upgrade to the latest release (1.9.1) of IR

Thank you very much that fixed it.