With Forge Buckets enabled you can not pull liquids out of a fluid tank from the inventory.

Forge buckets do not register as buckets, that's a bug in Forge

What? But it hasn't been 'fixed' in forge and no one else is having a problem. Doesn't that make it your fault?

why is this his fault?! its a missing support at most.

I prefere him working on real issues instead of workarounds for other peoples faults that may be patched later, rendering the effort for the workaround a waste of time :)