Modpack version
0.4.8

Describe the bug
Once an Ender Tank is placed in the world, being near it, and looking toward it causes other entities to be visible through blocks. Attached are a few screenshots. I am using OptiFine: preview_OptiFine_1.16.5_HD_U_G8_pre1

Here is another thread on the topic and someone asked about that looks like they have the same issue as me: https://www.reddit.com/r/feedthebeast/comments/letuno/seeing_entities_through_walls_with_modded/

The last screenshot is an example of the Ender Tank no longer being visible, causing it to go back to normal.

Optifine causes all sorts of issues with rendering. Nothing et can do about it.

Turn off fast render.