This is honestly a tough thing to explain but, when I put down an ender tank or I interact with the ender chest from the mod, textures "pop" in relative to their positions in the world. I'll add a video to try and explain it better but it only happens when I put down the Ender tank or I open the ender chest.

Video: https://youtu.be/sraWiavlPzo

I also tried using older versions but they all have the same issue

Using Optifine is going to cause rendering issues that aren't easily fixable, turn off fast render for less issues.
Optifine is not supported.

After doing much needed testing, it turns out to be an issue with Fast Render with Optifine