Modpack version
Newest version

Can the issue be reproduced?
Yes, see video below.

Logs
No log applicable

Issue
several tile entities behave wrong under water.
Tested: Aqueous Accumulator, Fluxducts, Mekanism Universal cables

See this video: https://streamable.com/vjyov

Is it just their rendering or do they not work either?

They don't work. The guis also don't open

Also, things like the aqueous accumulator are duplicated when I try to break them.

Interesting O_O

Those "dead spots" are also at other places:
https://streamable.com/tdc4w
(When I place a chest on the spot where the carrots drop, the gui doesn't open either.)

Streamable

2fb5Lp0LgS - Streamable

Check out this video on Streamable using your phone, tablet or desktop.

I'm afraid I can't reproduce this.