I have liquiduct and iron tank outdoor, yet there is no water in my liquiduct nor tank.
How to reproduce?
I am using a steel tank (3x3x4) and I just leave the tank at a chunk loaded area. I have nothing connected to the tank at all.
It takes quite a while for that 100mb water to get in there, usually takes a couple days (real world time) if you are lucky.
While the water gets in the empty liquiduct happened more frequently, usually after a night you will see some water in it and I am pretty sure it is not visual bug, because when I pump another liquid out from the machine that connected to the liquiducts, it is blocked.
I have no idea how this happened, but the one empty tank that has this problem is in an outdoor area. So my best guess is because it is outdoor?