Preview doesn't work on edit post page

Preconditions
User1 is logged in and has permissions for edit posts
There is Post1 and Post2 in Topic1

Steps to reproduce
1. User1 goes to Topic1 and press "Edit" button for Post2
2. User1 press "Preview" button on post edit page

Actual result Nothing happens

Expected result Post preview should be shown

Note Preview for adding post form (on topic page) and on topic creation page works as expected