So im playing with EnderStorage-1.16.4-2.7.0.159-universal and I crafted an endertank for a lava farm. Well when I placed the ender tank down it was showing me the spawner and chests next to my house along with a few things way underground. Here is a video showing what is happening. I dont quite know how to explain it. Hope I did my best lol.

Video was too big so had to upload somewhere else. Its a quick 23 second video showing it.
https://streamable.com/9frhmp

Also placing the ender tank on top of a builder in the nether did this...

Can confirm this glitch. I'ts also happening to me.
Maybe the newer 1.16.4-2.7.0.161.jar is fixing this problem.
I'll get back later if it fixed this glitch. :)
[EDIT]: So I tried the new files (CodeChickenLib-1.16.4-3.5.0.401-universal & EnderStorage-1.16.4-2.7.0.161-universal) but unfortunately it didn't help. The Glitch still persists. :(

Also having a similar issue, whenever the endertank is in view, all tile entities appear through walls

I have been unable to reproduce this issue, do you have Optifine installed?
Can I also have a client log if possible?

Allright so I tested it without Optifine and @xElementzx was right. Optifine was indeed the culprit.
Maybe using a different version of Optifine and Optiforge will fix it.
I'am going to try out different versions and post my results here if it's OK. :)
Issue could probably be closed.

But what makes me wonder is why in older version the tanks and chests always worked fine even with Optifine installed.
Hmm weird...

That is fine to test it out @Ordenkeim93499 I have stopped playing 1.16.4 currently so till more come out and things are more stable. And it could be the new rendering layout. I believe Microsoft changed all that in the new versions. Optifine changes a lot of things behind the scenes and likes to conflict with a lot of mods. That’s why authors ask for it in cases like this cause it’s usually an Optifine issue and not theirs.