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Hi,
Are you using an original Sony charger and do you charge via wall socket? Do you mean that the phone was fully charged when you did not use it or was the battery completely drained?
I do not think it's a bug. Depending on the configuration of the phone, which apps that are active in the background and also how you use it, can make the battery drain even if it's connected to the charger. But of course it will drain the battery slower compared to when it's not connected to the phone.