I have been trying to play modded 1.20.1 minecraft with both Alex's Mobs and Alex's Caves, I have Complimentary Shaders installed and activated at the same time which seems to make some of the mobs in both mods invisible, does anyone happen to know what the problem is, and if there is a possible solution?

I had similar problem, but only with Alex's caves. The problem is due to incompatibility with shaders. It's a shame, but is it, how it is.

I had similar problem, but only with Alex's caves. The problem is due to incompatibility with shaders. It's a shame, but is it, how it is.

Same here, I learned that Optifine somehow made issues with the wearable items in Alex's Mobs but was fixed when replaced with Embeddium and Oculus.