Due to a printing error, your packet of 2020 'Imperial Green – Pre Qing Ming' may say '2019' season on it.
To check if you have received a 2020 picking, simply look at the 'BATCH' on the back of the packet. If you see 'BATCH: 0520' then it means you have a 2020 picking of Long Jing.
Again, apologies for the error and please check the BATCH number to confirm the picking date of your Long Jing tea.