Cannot edit a file change from the change request edit link

Reproduction steps:

• Create a new change request by editing an existing page
• Go in file changes and click on the edit link
• Insert new changes
• Click save

Expected result:

• the new changes are properly saved

Obtained result:

• the new changes are not saved and we obtain the following stack trace root cause:

  Caused by: 
  org.xwiki.contrib.changerequest.ChangeRequestException: Cannot find file change with version [filechange-2.2]
  	at org.xwiki.contrib.changerequest.internal.handlers.AbstractChangeRequestActionHandler.prepareDocument(AbstractChangeRequestActionHandler.java:207)
  	at org.xwiki.contrib.changerequest.internal.handlers.AddChangesChangeRequestHandler.handle(AddChangesChangeRequestHandler.java:93)
  	at org.xwiki.contrib.changerequest.internal.handlers.ChangeRequestResourceHandler.handle(ChangeRequestResourceHandler.java:11