Error while migrating SearchSuggestConfig page from 4.1.4 to 5.2.1 with DW

Steps to reproduce:

• Setup a XEM 4.1.4 (I used Tomcat + MySQL)
• Manually import the manager-ui-all XAR
• shutdown the wiki and replace the war with a XE 5.2.1
• startup
• DW kicks in. Select "This is an upgrade" and then select 4.1.4 from the dropdown
• Click on "Repair"
• While upgrading, you'll briefly see an error (with red color)

      Importing document [SearchSuggestConfig] in language []...
      Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.xpn.xwiki.objects.LargeStringProperty#<?xml version="1.0" encoding="UTF-8"?> <query>filename:__INPUT__* AND type:attachment</query> ]
      Failed to import document [SearchSuggestConfig] in language []
  

Same behaviour when upgrading to 5.3 M2 also