Squeak through entities that you can't walk between normally.
A highly configurable and more compatible version of Squeak Through, written from scratch.
Tweaks
Mod category: Tweaks
Small changes concerning balance, gameplay, or graphics.
It looks like fluid must flow is using the compatibility flag to intentionally disable squeak through on its pipes.
Maybe raiguard can be convinced to add a mod setting to FMF if squeak through is present, and that will override the value set by default.