Page variation can not be Submitted for publication if one of page variations is in pending state

1. Start staging for Liferay site
2. Go to staging
3. Manage page variation - add 4 new page variations (alfa, beta, gama, theta)
4. assert you have enabled Submit for publication button at each page variation
5. now do some changes to page variation beta
6. click Submitt for Publication
After this button Save for publication is disabled also in variations alfa, gama and theta despite the fact we havn't done any changest to them neither explicitely Submitted those variations for publishing.