Camera app loses draft when multitasking

From within the Camera app, if you choose to share a photo using email, begin writing your message, switch to another app (Safari, for instance), then switch back to Camera, you're presented with the camera interface and your draft is gone. You are not given the option to save your draft unless you press the cancel button before switching out of the Camera app.

This does not occur in the Photos app. If you choose to share a photo using email from the Photos app, switch out, and switch back, you're brought right back to where you were and can freely multitask without losing your draft message.

Steps to reproduce:

1. Launch the Camera app
2. Take a photo
3. View the photo by clicking the thumbnail in the bottom left
4. Click the share button
5. Select Mail
6. Type a subject
7. Press the home button twice and switch to an app besides camera
8. Press the home button twice and switch back to Camera

Result:

Camera interface to take a new photo is displayed

Expected:

Draft message is displayed

Expected (alternate):

• Camera interface to take a new photo is displayed
• Draft message is stored in Drafts folder

Workaround:

• Before switching to another app, press Cancel, then select Save Draft
• Instead of switching back to Camera, switch to Mail and find the message in your Drafts folder

From the iOS Human Interface Guidelines:

People expect to have ample opportunity to cancel an operation before it begins, and they expect to get a chance to confirm their intention to perform a potentially destructive action. Finally, people expect to be able to gracefully stop an operation that’s underway.

⚠ Multitasking should not be a destructive action.

If this is behaving as designed, it's not insanely great, it's insanely unintuitive.