Steps to reproduce:
1) Create a new ContentType
2) Create an object of this ContentType, publish it
3) Edit it and save a draft. Repeat this step 6 times to get 6 different drafts.
4) Configure workflow for this ContentType
5) Edit the content object and move it to another workflow stage

Current result:
You will get an exception like the following:

Key "8" in object with ArrayAccess of class "Symfony\Component\Form\FormView" does not exist.

Expected result:
A new draft should be listed in the separated table under the `Versions` tab in AdminUI's content view.

Note:
This is somehow related to the version pagination. If there are less than 5 drafts the exception is not thrown and everything works fine.
Apparently, there is no form field (checkbox) to handle a given version related to the workflow draft.
The exception is thrown via Twig in /ezsystems/ezplatform-admin-ui/src/bundle/Resources/views/content/tab/versions/table.html.twig:45