DO NOT REPORT AN ISSUE IF YOU HAVEN'T TESTED THE ISSUE WITH THE LATEST VERSION IN CURSEFORGE

Functional Storage Version:
functionalstorage-1.21.1-1.5.5

Titanium Version:
titanium-1.21-4.0.40

Crashlog If Applicable (Upload to pastebin/gist):

Fluid drawers stop pushing/pulling fluids and will only work after taking the upgrade out and putting it back in again. I believe this occurs when the chunk stops being loaded and is reloaded again.