Water barrel lose all liquid when piped

[agile fossil]

I have a water barrel for my sinks, occasionally i log in and its empty. The others all full still. Its just me in my base. Im not sure exactly when or why its happening.

[deep bramble]

I've noticed this as well in single player on experimental. As if over time the required amount is drained slowly, even when not in use until the barrel is empty. The only workaround I found was to connect things to the barrels as needed, and disconnect afterward.