I would say your new battery has a problem cell where the voltage in that cell has dropped significantly below the other two cells. A healthy pack won't have a cell that drops way below the others just from sitting at storage level.
Borrow or buy a
Cell Checker and test the pack. A cell checker has a digital display on it and plugs into the balance plug of the pack and it reads and displays the voltage in each cell,
If the pack has a low cell all chargers will error out when trying to charge . More modern chargers will give an error such as "low voltage"
Call the manufacturer and send it back or get it replaced.