<br> vs \n in side a <pre>

[yuhai]

Test the issue from ​http://ckeditor.com/demo#full

1. Set config.enterMode = CKEDITOR.ENTER_BR;
2. See the differece in behavior between 2.1 and 2.2:

2.1. Type two lines content(<br> will exist), select them, click Formatted. <br> will be replaced /n in side a <pre>
2.2. Click Formatted, type two lines. <br> won't be replaced with /n in side a <pre>

How do solve the inconsistent behavior? Can we keep <br> after clicking Formatted?

Thanks in advance.