Reproduction

1. Have a book with:
   1. two versions
   2. one unversioned page
   3. one versioned page with content for both version
2. Go to the unversioned page
3. The dropdown version selector will display one version
4. Change the selected version
5. Navigate to the versioned page

Result

The versioned page will display the content for the version of step 3.

Expectation

The displayed content should be from step 4.

Workaround

Go to the versioned page and select the appropriate version there