Steps to reproduce:

1. Add two new languages i.e. ger-DE, fre-FR.
2. Create an Image content and translate it using these two languages.
3. Observe the ezcontentobject_attribute table.
4. Create a new article content and embed the image from step 2 in the rich text field.
5. Translate this article into two other languages.
6. Preview translation in the Back Office or frontend - notice the growth of the ezcontentobject_attribute table.
7. Clear the persistence cache and preview contents again in different languages - notice additional records being added.

Result:
The ezcontentobject_attribute table grows in size after previewing content in a different language.

Expected result:
There should be no additional inserts made during the preview.