The customer reported an issue with adding the custom tags in Rich Text Editor. No new line can be added below the inserted custom tag (e.g. Twitter post) in the RTE.

Steps to reproduce:

1. Login to the admin panel.
2. Create a content with Rich Text field type (ezrichtext).
3. Create a custom tag (e.g. Twitter post) inside Rich Text field via RTE.

Result:
No new line can be added below the custom tag.