Cannot discard draft when there is an experience in a content page

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.3.3 CE GA4, 7.3.10 DXP GA1, Master
• Component/s: Content Page Experience Personalization
• Labels: None
• Fix Priority: 3
• Git Pull Request: https://github.com/liferay-echo/liferay-portal/pull/822

Steps to reproduce:

1. Go to Site Builder > Pages
2. Create a new page based on "Blank" template and give it a name
3. Add some elements to the page
4. Add a new experience by giving it a name selecting or creating a new segment
5. Press save
6. Publish the page
7. Edit the page
8. Add some new elements to the page
9. Press the "Discard Draft" button

Expected result: The changes are reverted

Actual result: The changes are not reverted

Note: The back button also disappears from the page