fix(proxy-state-tree): fix tracking paths of derived

Author: christianalfoni

packages/node_modules/proxy-state-tree/src/Proxyfier.ts

@@ -205,9 +205,6 @@ export class Proxifier {
         const nestedPath = proxifier.concat(path, prop)
         const currentTree = trackingTree || proxifier.tree
 
-        trackingTree && trackingTree.proxifier.trackPath(nestedPath)
-        currentTree.trackPathListeners.forEach((cb) => cb(nestedPath))
-
         if (typeof targetValue === 'function') {
           return proxifier.tree.master.options.dynamicWrapper
             ? proxifier.tree.master.options.dynamicWrapper(
@@ -216,6 +213,9 @@ export class Proxifier {
                 targetValue
               )
             : targetValue(proxifier.tree, nestedPath)
+        } else {
+          currentTree.trackPathListeners.forEach((cb) => cb(nestedPath))
+          trackingTree && trackingTree.proxifier.trackPath(nestedPath)
         }
 
         if (targetValue === undefined) {