Describe the bug
When I place a track blueprint with a railbed, the rail and the ties are black, and flicker occasionally.

How to reproduce
Steps to reproduce the unwanted behavior:

1.Get a track blueprint
2. Switch the railbed to any one of the blocks
3. Place down the track

Expected behavior
The track does not render black with a railbed.

Screenshots

System Information
OS: Windows
System Memory: 32gb
Allocated Memory: 4gb
CPU: Intel i5-7440HQ
GPU: #0 Intel HD Graphics 630
#1 Nvidia GeForce 930MX
IR-Version: This issue persists from version 1.5.0 to 1.6.1, all on Minecraft 1.12.2
Forge-Version: ["1.12.2 - 14.23.5.2859"]

Modlist

latest.log
Provide the latest.log by going into your Modpack_folder/Logs, paste the contents of the file to an online service like https://pastebin.com/ and provide a link.
2024-04-19-4.log.gz
2024-04-19-5.log.gz
2024-04-19-6.log.gz
2024-04-19-7.log.gz
2024-04-17-2.log.gz
2024-04-19-1.log.gz
2024-04-19-2.log.gz
2024-04-19-3.log.gz

Additional context
The issue persisted even when Immersive Railroading was the only mod (+Track API and UMC [when necessary])

These are very old IR versions. We are not actively supporting those anymore.