Forge: forge-1.12.2-14.23.5.2860-universal
ChestTransporter : ChestTransporter-1.12.2-2.8.8
Yabba: YABBA-1.1.2.54.jar

When picking up a Yabba barrel, tested with normal barrels and anti-barrels, for some reason it also drops an empty barrel on the ground. Like you broke it. It also fills up the chest transporter. From what I can tell, the barrels are empty that are being thrown in the world.