Steps to reproduce

1. Log in

2. Hi, username! > My Bookmarks > Bookmark External Work

3. Enter a URL that uses https in the URL field, e.g. https://google.com

4. Fill out the rest of the form as required

5. Press "Create"

6. You'll be on the page for the bookmark you just created. Follow the linked work title to access the external work.

7. Now that you're on the external work page, right click on the linked work title and copy the link/address

8. Paste it somewhere

What happens

The address that you paste now says http://google.com.

What should happen

It should still be an https URL.