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In the 1.21.1 version of More Red, there is a known issue with Sodium which causes cables to render incorrectly. It can be fixed by using Embeddium instead of Sodium:
https://www.curseforge.com/minecraft/mc-mods/embeddium
Redstone-based plate-shaped logic gate blocks! You can rotate them and place them on walls and ceilings!
The blocks show you a preview of where you're about to place them when you're about to place them!
Wire anything to anything!
Attach wires and cables to walls and ceilings!
Renders placement previews for block items specified in resource pack files
Renders placement previews for block items specified in resource pack files
