Factorio Forums

Found out that none of inputs/outputs of both barrelling and unbarrelling (empty barrels, fluid barrels and fluids itself) not counts toward production statistics (neither production, nor consumption tabs) at least in sandbox scenario maps.

I believe that's by design; the (un)barrelling recipes all have catalyst_amount=amount on both ingredients and results, which as a side effect excludes them from production stats; it's probable they also have the flag set on the recipe that excludes the recipe as a whole from production stats.

It makes sense; you're not actually making anything when (un)barrelling; you're basically using the assembler as a fancy sort of fluid inserter.

Yes, and it is not a bug, but a feature.