Since the last update, Thunderbird has been sending a duplicate draft copy to my inbox of any email I'm writing, every time a draft is automatically saved. It is also saving it as normal to the drafts folder, but sending a copy to my inbox is very confusing as I don't know whether it has been sent to the recipient in error.

Is anyone else experiencing this? Was this an intentional update, or is it a bug? I hope it's a bug that is being looked into, as it is not welcome!