Pages added to a site variation should only show in that variation

• Type: Regression Bug
• Status: Verified
• Resolution: Unresolved
• Affects Version/s: Master
• Fix Version/s: None
• Component/s: Staging
• Labels: None
• Story Points: 1
• Fix Priority: 3

Steps to Reproduce:

1. Create a new site with a public page.
2. Enable local staging with page variation enabled.
3. Navigate to staging site page.
4. Create new site pages variation named as 'Summer'.
5. Go to Product Menu -> Site Builder -> Pages.
6. Assert 'Summer' is choosed as the current site pages variation.
7. Add a public page 'aaa' under 'Summer'.
8. Click on 'Main Variation' for choosing it as the current site pages variation.

Expected result:
Page 'aaa' shouldn't display under 'Main Variation'.

Actual result:
Page 'aaa' displays under 'Main Variation'. Page 'aaa' disappears after refresh the page.