This Solar Reflector from Immersive Technology mod not rendered properly (one corner is cutted) and Mirrors are not rendered at all.

How its rendered:

How it should looks like:

Similar Issue with Steel Fluid Tank - its not rendered at all

The Issue is cased by improper rendering on Immersive Technology's side. The rendering method simply calls the render functions provided through the IE multiblock interface. I may look into making a fix myself however that is highly unlikely in the near future.