We have a workflow with a conditional decision that moves a document to a particular folder if the folder is empty and merges with a file if the document exists.  

When the version control activity is used to add version comments, and the destination folder is empty, version comments are applied correctly.  If the document already exists and pages are merged, two different version comments will be applied.  The first will display the comments correctly and the second will not show any comments.  Every attempt to merge files after that will produce two versions both with empty comments.  I have attempted moving the Version Control activity to just about every portion of the workflow possible thinking another activity is causing the duplication, but placing this activity at the end of the workflow produces the same result.  

That said, I also have an Assign Field Values activity that takes the same token data and adds this to a read-only "version history" field.  This field displays exactly the same information as I wish to have in the version comments.  

What could be the underlying issue with this version comments issue in Workflow?  Any help would be greatly appreciated.

Thanks!