There is a bug about 2020. Please DO NOT recharge your driller pet or any other timed items (e.g., pouches) for a time period that goes beyond December 2019. If you recharge, for example, for 60 days, which goes more than December 2019, your item will remain expired.
If you want to recharge, make sure the time period goes only until December 2019.
Coder will fix this bug later.