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.