delete id deltas reserved

d2oracle/edit.go

@@ -1864,6 +1864,12 @@ func DeleteIDDeltas(g *d2graph.Graph, key string) (deltas map[string]string, err
 	conflictNewIDs := make(map[*d2graph.Object]string)
 	conflictOldIDs := make(map[*d2graph.Object]string)
 	if mk.Key != nil {
+		ida := d2graph.Key(mk.Key)
+		// Deleting a reserved field cannot possibly have any deltas
+		if _, ok := d2graph.ReservedKeywords[ida[len(ida)-1]]; ok {
+			return nil, nil
+		}
+
 		var ok bool
 		obj, ok = g.Root.HasChild(d2graph.Key(mk.Key))
 		if !ok {

d2oracle/edit_test.go

@@ -4895,7 +4895,18 @@ x.y.z.w.e.p.l -> x.y.z.1.2.3.4
   "x.x": "x"
 }`,
 		},
+		{
+			name: "nested-height",
 
+			text: `x: {
+  a -> b
+  height: 200
+}
+`,
+			key: `x.height`,
+
+			exp: `null`,
+		},
 		{
 			name: "only-reserved",
 			text: `guitar: {