Index: src/main/java/org/apache/jackrabbit/oak/plugins/memory/MemoryNodeBuilder.java
===================================================================
--- src/main/java/org/apache/jackrabbit/oak/plugins/memory/MemoryNodeBuilder.java	(revision 1584265)
+++ src/main/java/org/apache/jackrabbit/oak/plugins/memory/MemoryNodeBuilder.java	(working copy)
@@ -703,7 +703,7 @@
                 // to unconnected and connect again if necessary.
                 // No need to pass base() instead of base as the subsequent
                 // call to update will take care of updating to the latest state.
-                builder.head = new UnconnectedHead(builder, state);
+                builder.head = new UnconnectedHead(builder, builder.base);
                 return builder.head.update();
             } else {
                 return this;