Can't remove line enters from styled email when forwarding

[Hirobreak]

Describe the bug
When you forward an email and try to edit the email content, some lines can't be deleted; you can delete the content but not the line enter

To Reproduce
Steps to reproduce the behavior:

1. Forward a styled email
2. try deleting all the line rows

Expected behavior
It's expected that every line enter will be removed as well as the content

Device and System information (please complete the following information):

• Device: iPhone X