Disappearance of 'Delete contact' button

[VadimIpatov]

It's related to the IOS version.

How to reproduce:

1. Go to the info of the contact which you want to delete
2. Tap 'Edit' and 'Delete contact' then
3. Tap 'Cancel' when it asks for confirmation

After the above actions, the 'Delete contact' button disappears and there is no way to get it back.