MC: 1.21.1
Mod Ver: 5.4.6
Modpack: ATM10

The Capacitor has an Occlusion issue and does not render the block placed next to it, through the air gapes, showing blocks in the background. See in the image below.

The Deriver does not have a backside to the textures shown on the outside when looking through the air gape on the sides. See the image below.