Steps to reproduce:

1. Log in to back office.
2. Go to Content / Content types / Content.
3. Start creating a new Content type.
4. Being on create a new Content type form expand 'Add' dropdown.
5. Click on 'Content' (nothing happens).
6. Expand 'Add' dropdown once again.

Actual result:

See attached screenshots and watch gif please: https://recordit.co/rd6qkw7jpU

Add dropdown contains available option Content which should not be active.

Expected result:

Content option is not active, user cannot select this option.