Small bug when saving a draft

Hi,
I may have found a small issue with the latest 10 version when saving a draft. Let’s say I have two mail accounts, A and B. My address on A is [email protected] and on B is [email protected]
I start wrirting a draft with my A account and save it (without sending), so the draft is logically saved in A.com Draft folder. Then I reopen it, change the sender to B account ([email protected]), perform some changes and then save it again. Logically, the draft should be saved in the Draft folder of the B account. But it stays in the Draft folder of the A account, until I send it. When sent, the mail logically returns to the Sent folder of B account.

So I don’t see why it is not moved in the Draft folder of the B account when I change the sender to [email protected]. That’s what Postbox was doing…
Could this be fixed ? Thanks.