Installed mods:
TechReborn-5.2.0
Modern-Dynamics-0.2.0-beta
fabric-api-0.53.4+1.18.2

The situation
https://imgur.com/a/jjddCJg

Do you have fabulous mode on?

No, i don't.

https://imgur.com/a/Jictg1K

It's not the fault of Tech Reborn either; here it is with just Modern-Dynamics-0.2.0-beta and appliedenergistics2-11.0.0

Ah, I see. What's actually happening is that the pipes are empty at all times since the transfer is instant. I will look into making the pipes display something when they are empty but fluid is going through them.

Ah, I see. What's actually happening is that the pipes are empty at all times since the transfer is instant. I will look into making the pipes display something when they are empty but fluid is going through them.

Fabric 1.19.2, TechReborn 5.4.0, Modern-Dynamics-0.6.1-beta
The same issue is still present. Pipes are only rendered either empty or full.
But why is there water in the pipes on the screenshots on the CurseForge then, and they looks like semi-full?

That's because the output was full, so the fluids were staying in the pipes.