There's was still a hidden reference to ZODB versions

src/App/dtml/debug.dtml

@@ -104,9 +104,9 @@ Delta
 
 <li>Connections:
 <table border="1">
-<tr><th>opened</th><th>info</th><th>version</th></tr>
+<tr><th>opened</th><th>info</th></tr>
 <dtml-in dbconnections mapping>
-  <tr><td>&dtml-opened;</td><td>&dtml-info;</td><td>&dtml-version;</td></tr>
+  <tr><td>&dtml-opened;</td><td>&dtml-info;</td></tr>
 </dtml-in></table>
 
 </ul>