Drafts are not deleted - No draft ID found

The steps to reproduce are as follows:
1. Edit a page and navigate away without saving. (Before navigating away it does appear some error appears regarding saving the draft, although it seems to save successfully anyway)
2. Return to the page and edit.
3. At the top where it notifies you about the saved draft, click "view the change".
4. In the resulting popup, click the discard button.