another approach

client/src/components/ChooserWidget/PageChooserWidget.js

@@ -34,7 +34,7 @@ export class PageChooser extends Chooser {
       matchSubclass: this.opts.matchSubclass,
       canChooseRoot: this.opts.canChooseRoot,
       userPerms: this.opts.userPerms,
-      parentId: this.opts.parentId,
+      instanceId: this.opts.instanceId
     };
     if (this.state && this.state.parentId) {
       opts.parentId = this.state.parentId;

client/src/entrypoints/admin/page-chooser-modal.js

@@ -251,6 +251,9 @@ class PageChooserModal extends ChooserModal {
     if (opts.userPerms) {
       urlParams.user_perms = opts.userPerms;
     }
+    if (opts.instanceId) {
+      urlParams.instance_id = opts.instanceId;
+    }
     return urlParams;
   }
 }

wagtail/admin/views/chooser.py

@@ -292,10 +292,12 @@ class BrowseView(View):
                     selected_locale = get_object_or_404(
                         Locale, language_code=request.GET["locale"]
                     )
-                    active_locale_id = selected_locale.pk
+                elif request.GET.get("instance_id"):
+                    page_instance = Page.objects.get(id=request.GET["instance_id"])
+                    selected_locale = page_instance.locale
                 else:
-                    active_locale_id = Locale.get_active().pk
-                    selected_locale = get_object_or_404(Locale, id=active_locale_id)
+                    selected_locale = Locale.get_active()
+                active_locale_id = selected_locale.pk
 
                 # we are at the Root level, so get the locales from the current pages
                 choose_url = reverse("wagtailadmin_choose_page")

wagtail/admin/widgets/chooser.py

@@ -300,8 +300,11 @@ class AdminPageChooser(BaseChooser):
         opts = super().get_js_init_options(id_, name, value_data)
         value_data = value_data or {}
         parent_id = value_data.get("parent_id")
-        if parent_id is not None or self.page_instance is not None:
-            opts["parentId"] = parent_id or self.page_instance.id
+        if parent_id is not None:
+            opts["parentId"] = parent_id
+            
+        if self.page_instance is not None:
+            opts["instanceId"] = self.page_instance.id
         return opts
 
     @property