Standing slightly far away from Indrev machines and looking north makes them invisible on one side, standing close to them the same side looks darker than other sides
Also the lazuli flux containers have flickering textures on some faces where the output arrow is
Some examples of the missing arrow, the invisible faces and a comparison of the color of the sides:

Technical Information:

• Minecraft: 1.20.1
• Fabric API: 0.91.0
• Industrial Revolution: 1.16.5-BETA
• Modpack: All of Fabric 7 1.3.2