Ticket #20289: 20289.patch

src/org/openstreetmap/josm/actions/UnGlueAction.java

@@ -312 +312 @@
 
     private static Node cloneNode(Node originalNode, List<Command> cmds) {
         Node newNode = new Node(originalNode, true /* clear OSM ID */);
+        if (!newNode.isTagged() && newNode.hasKeys())
+            newNode.removeAll(); // see #20289
         cmds.add(new AddCommand(originalNode.getDataSet(), newNode));
         return newNode;
     }

src/org/openstreetmap/josm/gui/dialogs/PropertiesMembershipChoiceDialog.java

@@ -142 +142 @@
     }
 
     private static boolean isTagged(final Collection<Node> existingNodes) {
-        return existingNodes.stream().anyMatch(Node::hasKeys);
+        return existingNodes.stream().anyMatch(Node::isTagged);
     }
 
     private static boolean isUsedInRelations(final Collection<Node> existingNodes) {