Describe the bug
I place the track blueprint and move away from the chunk to unload it and come back, only to see the track(s) disappear visually. I have kilometers of track and the problem seems to occur only within a specific stretch of my tunnel in the world. I have marked the stretch with Lapis Lazuli blocks in a screenshot below. The problem shows up not only in my game, but also in my friend's game.

How to reproduce
Steps to reproduce the unwanted behavior:

1. Place the track blueprint
2. Move away far enough to unload the chunk
3. Come back and see the tracks

Expected behavior
The tracks should have been visible.

Screenshots
A video of the problem: https://youtu.be/PjkS8_pm1vc
A few hours later, the left side(the side shown in the video) no longer has the problem but the other side has the problem.
Screenshot after a few hours: https://imgur.com/a/5KmOeWP
The space between the Lapis Lazuli blocks show where this bug occurs.

System Information
My system(client):
OS: Windows 10
System Memory: 8 GB
Allocated Memory: 5500M
CPU: Intel i7 6700K
GPU: Nvidia GTX 660
IR-Version: 1.7.2_1.12.2 and 1.7.3_1.12.2 (both versions had the problem)
Forge-Version: 1.12.2 - 14.23.5.2847

The server information:
OS: Windows 10
System Memory: 12 GB
Allocated Memory: 8000M
CPU: Intel i5 3570K
IR-Version: 1.7.2_1.12.2 and 1.7.3_1.12.2 (both versions had the probem)
Forge-Version: 1.12.2 - 14.23.5.2847

Modlist
from server console: https://pastebin.com/Vy7shTMH
list of .jar files: https://pastebin.com/vL94S838
The mods in server but not in client:
spongeapi,sponge, spongeforge, luckperms, nucleus, worldedit

latest.log
The latest.log was taken from a running server:
https://drive.google.com/open?id=1rHMvEKBmO2KRB_ty9DKMaWPLDRHsG1jh

Additional context
a backup of the world: https://drive.google.com/file/d/1-4LpFj9Be1L9Kbm2MXQP4ctvkmAilZAe/view