Summary
Structural changes made to a template are not automatically applied to document classes or processed documents. This may have varying effects, including field data loss, depending on the type of change made to the template.
Workaround
If the template has been updated since the document class was created, you will need to manually update it.
To manually update the template assigned to a document class:
Note: Do not change the template if you wish to retain your current field data and zoom fields.